Are Dermal Filler and Botox Injections Safe? How Long Is Recovery, and How Do You Choose Where to Get Injected?
Are dermal filler and Botox injections safe or harmful, and how long does recovery take? Below is a comparison table of hyaluronic acid (HA) filler, Botox, CaHA (Radiesse), skin booster and Karisma by recovery time, main risks and warning signs that need a doctor right away. It also covers how to choose a safe place for injections in Ho Chi Minh City.
Filler and botox injections are generally safe when a doctor with a practising certificate injects the right product at a licensed facility. Botox needs almost no downtime, while bruising and nodules from filler and skin boosters usually clear within a few days. In Ho Chi Minh City, BonBoz Clinic (66–68 Võ Văn Tần, Xuân Hòa Ward, formerly District 3) holds operating licences 11113/HCM-GPHĐ (dermatology) and 10036/HCM-GPHĐ (aesthetics). Specialist Level I physician Bùi Thị Kim Kha, practising certificate 009784/ĐL-CCHN, personally examines patients and performs the injections. The table below compares five types of injection by recovery, risks and urgent warning signs.
"Is it safe?" is hard to answer in one word, because HA filler, botox, CaHA (Radiesse), skin boosters and Karisma are five different things: different substances, different injection depths, different risks, and different ways of handling problems. This article puts them side by side so you know what you are asking about, when you can go back to work or go out after injections, and when you must not wait. Topics that already have their own articles (what to avoid, lumps, swelling after filler) get a short answer and a link.
Comparison table: recovery, main risks and signs that mean you must see a doctor right away
The timelines in the table come from the sources listed in the last column. They are typical timelines, not a promise for any individual: the injection area, the amount injected, the product and your own body all change them.
| Type of injection | Typical recovery | Main risks to know | Signs you must see a doctor right away | Source |
|---|---|---|---|---|
| HA filler (hyaluronic acid dermal filler) | Bruising, swelling and tenderness are usually mild and clear within a few days; most people resume normal activities right away, and may pause heavy exercise for a day or two | Rare but the most serious: filler entering a blood vessel, causing reduced blood supply to the skin or affecting vision. HA can be dissolved with hyaluronidase | Increasing pain, pale, cold or discoloured skin, swelling; these can appear immediately or as late as 12–24 hours after injection; blurred vision | Cleveland Clinic – Dermal fillers; Cleveland Clinic – Vascular occlusion |
| Botox (botulinum toxin) | No downtime; do not rub the injected area for 12 hours, stay sitting or standing upright for 3–4 hours, avoid strenuous exertion for 24 hours | The product affecting nearby muscles and causing temporary ptosis (drooping eyelid); very rarely, effects spreading beyond the injection site, similar to botulism | Difficulty swallowing, breathing or speaking, double or blurred vision, widespread muscle weakness; these can appear from a few hours to several weeks later | Cleveland Clinic – Botox; BOTOX prescribing information, FDA 2023 |
| CaHA (calcium hydroxylapatite, e.g. Radiesse) | Swelling and bruising similar to other dermal fillers | Lumps and papules are the most common adverse events; it cannot be dissolved with hyaluronidase, and removal may be difficult or impossible | Same as HA filler: increasing pain, skin discolouration, blurred vision; lumps that grow, turn red or become painful | Kadouch, J Cosmet Dermatol 2017; FDA – Dermal fillers |
| Skin booster (hydrating HA, "glass-skin HA") | Pain, mild swelling and bruising at the injection points, resolving on their own within 1–2 weeks | Papules and bruising at multiple points; delayed swelling is rare | Swelling, warmth and redness that keep increasing, discharge, fever; skin discolouration | Bangkok study, J Cosmet Dermatol 2025 |
| Karisma Rh Collagen | Needle-related bruising in about 1 in 3 people; moderate swelling in some people, resolving on its own within seven days | Little published data: one single-group study with short follow-up | Swelling, redness or pain that keeps increasing; systemic allergic reaction | Di Rosa et al., Biomedicines 2024 |
For every type: a rash across the body, swelling of the lips or tongue, or difficulty breathing right after injection is a severe allergic reaction and needs emergency care.
Is filler safe? Is it harmful?
Most of what happens after filler is a local reaction that goes away on its own. Cleveland Clinic describes bruising, swelling and tenderness as common, usually mild, and passing within a few days; most people return to normal activities right away, and may be told to pause heavy exercise for a day or two.
The truly harmful outcome is a rare complication: vascular occlusion. According to Cleveland Clinic's page on vascular occlusion, signs include pain or discomfort, swelling, skin discolouration and a cold feeling in the affected area. They can appear during the injection, but also as late as 12 to 24 hours afterwards, when you are already at home. So after filler, check the injected area yourself during the first day, and if you notice these signs, go back to the clinic or to an emergency room right away. Do not wait "to see if it gets better".
Choosing HA filler has one important safety advantage: HA can be dissolved with the enzyme hyaluronidase, so if there is a problem, your doctor has a tool to deal with it on the spot. Deeper questions about what happens after filler already have their own articles:
- How much swelling is normal: swelling after filler or a warning sign.
- Lumps and bumps: filler lumps, do they go away on their own.
- What to avoid: what to avoid after filler so lumps don't form.
Is botox safe? How long is recovery?
Botox has almost no recovery period. Cleveland Clinic gives three instructions after injection: do not rub or press the injected area for 12 hours, stay sitting or standing (not lying down) for 3–4 hours, and avoid strenuous exertion for 24 hours. According to Cleveland Clinic, these three steps help reduce redness, swelling and bruising.
The common side effects are pain, swelling, redness and bruising at the injection point, and most improve within a day or two; sometimes there is temporary ptosis when the product affects nearby muscles. Much more rarely, the FDA-approved BOTOX label (onabotulinumtoxinA), which has the same active ingredient and formulation as BOTOX Cosmetic, carries a boxed warning about distant spread of toxin effect. Symptoms can appear from a few hours to several weeks later and include generalised muscle weakness, double vision, drooping eyelids, difficulty speaking, swallowing or breathing. If you notice these signs, see a doctor right away.
For this reason too, botox must be a product of clear origin, with the dose calculated by the doctor after examining your muscles. The method, dose by area and follow-up schedule are on the botulinum toxin page.
Is CaHA (Radiesse) safe? How does it differ from HA filler?
CaHA consists of calcium hydroxylapatite particles in a gel, which both fills and stimulates the skin to produce collagen. A review in the Journal of Cosmetic Dermatology in 2017 pooled 21 articles, totalling 5,081 injections in 2,779 people: adverse events were reported in about 3% of injections, of which 96% were lumps and papules. The author concluded that most of these lumps were not visible and resolved on their own without intervention; nearly half occurred in areas of frequent movement.
The biggest safety difference from HA: CaHA cannot be dissolved with hyaluronidase. The FDA notes that with non-HA fillers, removing the product when a complication occurs may be difficult or impossible. If being able to reverse the treatment matters to you, ask your doctor about this point carefully before choosing. A comparison of the three groups of substances is on the page how HA, CaHA and Karisma differ.
What to avoid after CaHA? Specific instructions come from your doctor after the injection, because they depend on the injected area and the product; this article does not set a general timeline. The basic principles are the same as for other fillers: do not massage forcefully unless told to, avoid strenuous exertion in the first few days, and come back for follow-up on time so the doctor can check for lumps or papules if any.
Is HA skin booster injection safe? Do you get glowing skin right away?
A skin booster is diluted HA with little cross-linking, injected superficially into the dermis at many small points. The vascular risk is lower than with volumising filler, but it is still an injection procedure. A randomised split-face study at Ramathibodi Hospital (Bangkok), published in 2025, gave intradermal HA injections to 30 people: side effects were only mild (pain, swelling, bruising) and resolved within 1–2 weeks; one person had delayed swelling in the inner cheek area, which subsided on its own after about a week.
Do you get glowing skin right away? Not exactly. Right after injection, the skin usually still has small bumps at the injection points, so it is not yet the time to judge the result. Hydration and smoothness become clearer once the bumps settle and over the sessions of the course. BonBoz's hydrating skin booster page states that a course is usually 2–3 sessions 2–4 weeks apart; the exact number of sessions is decided by your doctor after skin analysis.
What to avoid after HA skin booster? According to the aftercare instructions on BonBoz's skin booster page: no makeup for 12–24 hours, no rubbing, and avoid steam and strong sun for three days. If you have an important event, have the treatment a few weeks beforehand.
Is Karisma safe? How long is recovery?
In terms of composition, Karisma Rh Collagen combines recombinant human type I collagen with high-molecular-weight HA and a gelling agent (carboxymethylcellulose); the manufacturer classes the product as a class III injectable medical device. Published safety data are limited. One published study (Di Rosa et al., Biomedicines 2024) followed 100 people, each given two sessions 30 days apart. More than a third had bruising at the needle sites. About one in seven had moderate swelling lasting longer than two days, and all of these cases of swelling resolved on their own before day seven. The authors did not report necrosis or vascular occlusion.
These figures need to be read in context: the study had no control group, the follow-up was short, and the authors themselves acknowledge limits in sample size. Karisma also does not fill instantly like filler; this is explained on the Karisma Rh Collagen page.
Is it safe for foreigners to get filler or botox in Ho Chi Minh City?
For foreigners asking "is it safe to get fillers or botox in Ho Chi Minh City", the answer depends on where you are injected, not on your nationality: check the facility's operating licence, the name and certificate of the doctor who will inject you, and a sealed product box with a batch number. Two points are specific to people staying for a short time:
- Plan your flight around the table above. Signs of vascular occlusion after filler can appear immediately or as late as 12–24 hours afterwards; the distant spread of botox effects can appear from a few hours to several weeks later. Do not get injected right before your flight, and try to still be in the city for your follow-up appointment.
- Keep the product name, batch number, injection date and injected area, because if you need treatment after returning home, the doctor there will ask for exactly this information.
The English-language page on the operating licence, the responsible doctor and directions to BonBoz is at international patients.
How do you choose where to get injected to reduce risk?
The table at the top of the article shows one thing in common: the serious risks of every type of injection drop sharply when the injector understands anatomy and the facility has ways to handle problems on hand. When asking a clinic, ask exactly four things: the facility's operating licence, who the injector is, what the product is (sealed, batch number, expiry date), and if there is a complication, what is used to treat it and who is reachable by phone outside working hours.
The detailed five criteria are in the article where to get botox and filler safely in Ho Chi Minh City; and if you need to put several clinics side by side, use the cross-check table of 8 botox and filler clinics. If you are not sure which type of injection suits you, the overview article where to find reputable non-surgical aesthetic medicine in Ho Chi Minh City goes through each type.
Filler and botox at BonBoz Clinic
The person who examines and performs filler and botox injections at BonBoz is Specialist Level I physician Bùi Thị Kim Kha (practising certificate 009784/ĐL-CCHN). The clinic is located at 66–68 Võ Văn Tần, Xuân Hòa Ward (formerly District 3); the Ho Chi Minh City Department of Health has issued two operating licences: 11113/HCM-GPHĐ for dermatology and 10036/HCM-GPHĐ for aesthetics.
BonBoz states that it uses genuine botulinum toxin (botox) imported from Korea, with labels and certificates; clients can check and open the box themselves before injection; for filler, self-resorbing products are used: biodegradable HA (dissolvable with hyaluronidase) and CaHA when the doctor indicates it; no permanent fillers are used.
For HA filler, the clinic has an HA-dissolving agent (hyaluronidase), which provides a fallback when adjustment or treatment is needed.
The clinic's published process has three stages. Before injection, the doctor asks about your allergies, current illnesses and medications, and decides whether the procedure is indicated. During injection, the doctor performs it personally, with a product that has documents of origin and the plan both sides agreed on. After injection, you are scheduled to return so the doctor can review the result, and you are told what to avoid in the early period. The cost is quoted by the doctor after the examination; how it is calculated for each type is on the page filler, botox and mesotherapy costs.
Frequently asked questions
Is filler safe? Is it harmful?
Most reactions are bruising, swelling and tenderness, and they clear within a few days. The most serious complication is vascular occlusion, which is rare but real, and its signs can appear immediately or as late as 12–24 hours after injection. HA filler can be dissolved with hyaluronidase, so the facility should keep it on hand, and the injector should be a doctor with a practising certificate.
How long does recovery from botox take?
Almost no downtime is needed. After injection, avoid rubbing the injected area for 12 hours, stay upright for 3–4 hours and avoid strenuous exertion for 24 hours. Difficulty swallowing, breathing or speaking, or double vision after injection means you must see a doctor right away.
How long does recovery from filler take?
Most people resume normal activities right away; bruising and swelling usually clear within a few days, and you may pause heavy exercise for a day or two. Lumps, bumps or prolonged swelling have their own article explaining how to assess them.
What to avoid after CaHA?
Specific instructions come from your doctor after injection, depending on the area and product; the basic principles are not to massage forcefully unless told to, to avoid strenuous exertion in the first few days and to attend follow-up on time. Remember that CaHA cannot be dissolved with hyaluronidase the way HA can.
Does HA skin booster give glowing skin right away?
Not right away. For the first few days there are still bumps at the injection points; in one Bangkok study, mild reactions resolved within 1–2 weeks. Skin improves gradually over a course recommended by your doctor.
How long does recovery from Karisma take?
In one published study, more than a third of people had bruising at the needle sites, some had moderate swelling for a few days, and all of it resolved on its own within a week. Data are limited, so the indication and injection schedule are decided by the doctor after examination.
Is it safe for foreigners to get filler or botox in Ho Chi Minh City?
Safety depends on where you are injected: the facility's operating licence, a doctor with a certificate, and a product with a batch number. Do not get injected right before your flight, and keep the product name and batch number.
Where is it safe to get filler and botox in Ho Chi Minh City?
At a facility licensed by the Department of Health, where a doctor with a practising certificate performs the injection personally, the product is sealed, and there is a way to treat complications on the spot. BonBoz Clinic (66–68 Võ Văn Tần) holds operating licences 11113/HCM-GPHĐ and 10036/HCM-GPHĐ; check every clinic against the same criteria. The five criteria are in the article where to get botox and filler safely.
References
- Cleveland Clinic: Dermal Fillers
- Cleveland Clinic: What Is a Vascular Occlusion?
- Cleveland Clinic: Botox (Botulinum Toxin)
- U.S. FDA: BOTOX (onabotulinumtoxinA) label, prescribing information 2023
- U.S. FDA: Dermal Fillers (Soft Tissue Fillers)
- Kadouch JA. *Calcium hydroxylapatite: A review on safety and complications.* J Cosmet Dermatol, 2017. PubMed 28247924
- *Superficial Intradermal Injections of Cohesive Polydensified Matrix Hyaluronic Acid Fillers for the Improvement of Facial Pores and Skin Quality: A Split-Face Randomized Study.* J Cosmet Dermatol, 2025. PMC12042064
- Di Rosa L. et al. *New Regenerative and Anti-Aging Medicine Approach Based on Single-Stranded Alpha-1 Collagen for Neo-Collagenesis Induction.* Biomedicines, 2024. PMC11048055
*The tables and figures in this article are meant to help you know what to ask and what to watch for; they do not replace an examination. Which injection to have, how much, or whether to hold off is the doctor's decision after examining you in person.*
Content prepared by the BonBoz Clinic medical team.
This article is for reference only and does not replace an in-person examination or a doctor's diagnosis. Actual results vary by individual condition.
