Subclinical Acne (Closed Comedones): Causes and Scar-Minimizing Treatment Methods

Quick Summary: Comedonal acne (closed comedones / under-the-skin acne) forms when pores become clogged with dead skin cells and sebum, located deep beneath the skin without causing inflammatory redness or swelling. Attempting to pop these at home can easily worsen the condition, leading to post-inflammatory hyperpigmentation (PIH) and difficult-to-treat atrophic scars. To resolve this effectively, you need an in-person consultation with a dermatologist to accurately identify the root causes and develop a personalized treatment protocol combined with proper home skincare.

Under-the-skin acne refers to small bumps that form when pores are blocked by dead skin cells and sebum, lying hidden beneath the skin's surface — non-swollen, non-red, and without a head to squeeze, which is why conventional topical products often prove ineffective. From a distance, the skin may look fine, but touching it reveals a rough, bumpy texture across entire areas. That is comedonal acne. And the reason it frustrates so many people is that product after product yields no visible improvement.

What is comedonal acne and how to recognize it?

What comedonal acne actually is

Simply put, comedonal acne develops when pores become blocked — the American Academy of Dermatology (AAD) also describes acne as forming when pores become clogged, with the type of acne depending on what clogs them. Dead skin cells that fail to shed properly, combined with sebum, create a plug beneath the skin surface. Because there is no inflammatory reaction yet, it does not present with redness, swelling, or pain — it simply stays dormant, compromising the skin's smooth texture.

This is the key distinction from inflammatory acne. Inflammatory acne involves an active inflammatory response and bacterial involvement, requiring an entirely different treatment approach. Although both are called acne, they require distinct handling — which is why using a single cream for all types of acne rarely works. Furthermore, closed comedones possess an important characteristic: if left unaddressed over time, some lesions can progress into inflammatory acne.

What causes comedonal acne on facial skin?

Why you develop closed comedones

There is no single cause. In clinical practice, commonly encountered factors include:

• Abnormal skin desquamation (keratinization), causing dead skin cells to accumulate and clog pores.
• Skincare or cosmetic products that are unsuitable for your skin, particularly comedogenic formulations (AAD categorizes oil-based cosmetics and skincare products among factors that exacerbate acne).
• Inadequate or excessive cleansing. Both cause problems. Washing your face excessively with harsh products compromises the skin barrier, prompting a reactive overproduction of sebum (NHS (UK): do not wash acne-prone areas more than twice a day, as frequent washing can irritate the skin).
• Hormonal factors influencing sebum production (NHS (UK): certain hormones cause the sebaceous glands next to hair follicles to produce more oil and thicken the inner lining of the hair follicle, leading to blocked pores).
• Lifestyle habits and environmental conditions — late nights, chronic stress, prolonged mask-wearing that traps heat and moisture, and dusty environments.

An important note: you should not self-diagnose your underlying causes based on online information. Identifying your specific profile requires clinical evaluation by a physician, as the efficacy of your treatment protocol depends entirely on this diagnostic step.

Should you pop closed comedones at home?

What you should never do: popping it at home

This is the most critical part of this article.

Closed comedones lie deep beneath the skin and lack an open head. When you attempt to squeeze them, what you are actually doing is applying intense mechanical pressure onto an already obstructed tissue area. The typical outcomes:

• The plug is forced deeper into the dermis rather than expelled outward.
• The area transforms from non-inflammatory acne into swollen, red inflammatory acne.
• Tissue damage spreads to surrounding areas, leaving long-lasting post-inflammatory hyperpigmentation (PIH).
• If the tissue trauma is deep enough, atrophic scars will form — and atrophic scars are far more difficult to treat than acne itself.

The AAD explains similarly: when popping at home, the core is often pushed deeper into the skin, increasing inflammation, alongside the risk of bacterial infection from hands and permanent acne scarring. The NHS (UK) also advises against trying to "clean out" blackheads or squeeze spots, as this can worsen them and leave permanent scars.

Numerous cases of hyperpigmentation and atrophic scars presenting in the clinic stem not from the acne itself, but from improper manual manipulation. If you have already squeezed a lesion and the area is currently swollen and painful, seek clinical examination early rather than intervening further at home.

What is the medical-standard approach to treating comedonal acne at its root?

The proper treatment direction

Because acne is a dermatological condition, it requires a structured clinical protocol rather than a single miracle product. The procedure at BonBoz proceeds as follows:

1. 1Consultation and classification. A dermatologist directly examines and assesses your skin under specialized lighting to determine your exact acne variant, severity grade, and any concurrent skin conditions.
2. 2Identifying root causes. The physician reviews your skincare habits, active cosmetics and medications, menstrual cycle, lifestyle, and previous treatment history. This step directly dictates the accuracy and success of the treatment regimen.
3. 3Formulating a personalized protocol. The physician devises a tailored protocol for your specific condition, explaining what treatments/medications will be used, why they are indicated, the expected re-evaluation timeframe, and the associated costs.
4. 4In-clinic procedural treatments when indicated. If necessary, clinical procedures are performed strictly according to medical protocols and aseptic standards — not indiscriminate, full-face extraction in a single session.
5. 5Homecare guidance. You will receive detailed instructions on your daily routine, product application sequence, and equally important: which products to discontinue because they are worsening your skin.
6. 6Follow-up and protocol adjustment. As each individual's skin responds differently, the physician schedules follow-up visits to monitor clinical progress and make necessary adjustments. This is a mandatory step, not an optional one. If inflammatory breakouts worsen after 2 weeks of treatment, or if your skin experiences severe irritation from prescribed topicals, you should notify your doctor immediately rather than waiting for your scheduled appointment.
7. 7Treating residual PIH and scarring. Only after the active acne is fully controlled will residual hyperpigmentation and scarring be evaluated — as intervening on scarring while the skin remains inflamed is generally ineffective.

How long does it take for the skin to clear up?

How long until the skin improves?

This is the question everyone wants a specific timeframe for, but promising a universal timeline is an overstatement.

The rate of therapeutic response depends on the acne type, severity, underlying triggers, and your strict adherence to the prescribed regimen. The NHS (UK) notes that acne treatments can take several months to work; do not expect overnight results. One important aspect to anticipate: with certain active protocols, the skin may undergo a purging phase before stabilizing. If you discontinue treatment prematurely during this phase assuming the protocol is ineffective, you will return to square one.

Your dermatologist will define a specific re-evaluation milestone directly following your initial consultation, so you know exactly when to expect visible changes.

How to prevent comedonal acne from recurring after treatment?

What happens after the acne clears?

Acne is a condition prone to recurrence, particularly when maintenance care is stopped or when there are fluctuations in hormones, lifestyle, or environment. Therefore, post-treatment maintenance guidance is just as crucial as the active treatment phase itself. Your physician will thoroughly discuss this maintenance plan with you toward the end of your course.

If you are struggling with comedonal acne and have tried multiple methods without success, the issue may not lie in the individual products you have chosen. Coming in for a clinical consultation to have a physician accurately diagnose what your skin is experiencing is the first meaningful step.

When attending your consultation, please bring along or take photos of all the products you currently use. The physician will directly identify which ones to keep and which ones to eliminate.

See more: 5 Criteria for Choosing a Reputable Aesthetic Dermatology Clinic in HCMC

Frequently Asked Questions

How does comedonal acne differ from inflammatory acne?

Comedonal acne (closed comedones) lies deep beneath the skin surface, presenting without swelling, erythema, pain, or an open comedone head because an inflammatory cascade has not yet occurred. In contrast, inflammatory acne involves an active inflammatory reaction and bacterial involvement, presenting with painful swelling and requiring an entirely different therapeutic approach.

Why should you avoid popping closed comedones at home?

Closed comedones are situated deep in the skin and lack an open head. Attempting to squeeze them applies mechanical pressure on obstructed tissue, which easily forces the comedonal core deeper, triggers inflammatory swelling, causes tissue damage to spread, and results in persistent post-inflammatory hyperpigmentation (PIH) or difficult-to-treat atrophic scars.

Do I need to bring my current skincare products to the consultation?

Yes. When visiting BonBoz Clinic, you should bring along or take photos of all skincare and cosmetic products you are currently using. The physician will directly evaluate them to identify which suitable products can be retained and which comedogenic formulations should be discontinued.

Why does my skin experience more breakouts when starting treatment?

With certain comedonal acne treatment protocols, the skin may undergo an initial purging phase before transitioning into a stable, smooth state. This is a normal therapeutic response; you should persistently adhere to the prescribed protocol and avoid stopping mid-treatment to prevent returning to baseline.

How long does comedonal acne treatment take to show results?

Treating comedonal acne requires patience and strict compliance with the physician's prescribed protocol. Depending on the severity and specific skin condition, the dermatologist at BonBoz Clinic will design an individualized regimen and advise you on the expected timeline to achieve optimal results.

Does diet affect comedonal acne?

Diet can play a role in the formation and progression of comedonal acne in certain individuals. However, it is not the sole factor, and effective management requires addressing multiple contributing causes. The physician at BonBoz Clinic will provide specific guidance on lifestyle and nutritional adjustments appropriate for your treatment journey.

BonBoz Aesthetic and Dermatology Clinic — 66–68 Vo Van Tan, Xuan Hoa Ward, HCMC.

References

• NHS (UK) — Acne, accessed 22/09/2026
• American Academy of Dermatology (AAD) — Acne: Causes, accessed 22/09/2026
• American Academy of Dermatology (AAD) — Pimple popping: why only a dermatologist should do it, accessed 22/09/2026