Acne Treatment

Post-acne dark spots (Post-Inflammatory Hyperpigmentation — PIH)

Post-inflammatory hyperpigmentation (PIH) presents as flat brown, grey, or pink marks on the skin after inflammatory acne heals. Unlike atrophic scars, which are indented, dark spots are a pigmentation issue and typically fade over several weeks to months; sun exposure and picking or squeezing can make them darker. Dermatologists can accelerate the fading process using topical treatments, chemical peels, or laser toning.

Medically reviewed by BS.Ths.CKI Kim Kha — BonBoz Clinic

Why Do Dark Spots Persist After Acne Clears?

When the skin becomes inflamed, melanocytes are triggered to produce excess melanin. This melanin can deposit in the epidermis (causing brown spots) or drop into the dermis (causing grayish spots, which take longer to fade). Meanwhile, post-acne red or pink marks—known as Post-Inflammatory Erythema (PIE)—are caused by dilated capillaries rather than pigmentation; although they look similar, they require a different approach. Darker skin tones and individuals frequently exposed to the sun are more prone to hyperpigmentation.

How Do Dark Spots Differ from Atrophic Acne Scars?

Post-acne marks are flat and only involve a change in skin color; atrophic acne scars are depressed, creating an uneven texture that can be felt or seen under angled light. Pigmentation can fade on its own, whereas atrophic scars do not fill in naturally. Many people have both concurrently, and it is not uncommon to mistake dark spots for pitted scars—or vice versa. An accurate distinction ensures the right treatment path.

How Long Does It Take for Dark Spots to Fade?

Superficial epidermal pigmentation typically lightens within 1–3 months with diligent sun protection and by avoiding picking at the skin. Deeper dermal pigmentation can persist for 6–12 months or longer. Red marks (PIE) fade at their own pace and do not respond to conventional skin-lightening agents.

What Makes Post-Acne Marks Worse?

Sun exposure is the primary culprit, followed by picking, aggressive scrubbing, using irritating skincare products, and recurrent breakouts in the same spot. Additionally, unverified whitening products can trigger contact dermatitis, leading to more widespread hyperpigmentation.

How Does BonBoz Treat Post-Acne Hyperpigmentation?

A dermatologist conducts a clinical skin examination to differentiate between brown hyperpigmentation, deep dermal gray spots, and vascular redness, while also checking for active acne. For pigmented marks, the treatment protocol typically involves prescription brightening topicals, a series of gentle chemical peels, or laser toning for stubborn, deep-seated pigmentation—combined with mandatory sun protection. If active, inflamed acne is still present, controlling the breakouts takes priority to prevent new marks from forming.

Severity levels

1

Epidermal Hyperpigmentation

Pigment is located in the epidermis with well-defined borders. Typically fades within 1–3 months with proper sun protection and topical treatments.

2

Dermal Hyperpigmentation

Pigment has dropped into the dermis, appearing grayish-blue, and fades slowly (6–12 months). Laser toning treatment courses may be considered.

3

Post-Inflammatory Erythema (PIE)

Caused by dilated capillaries, not melanin pigment. Brightening agents are ineffective; an alternative approach is required.

4

Hyperpigmentation with Active Inflammatory Acne

New dark spots continuously form. Active acne must be controlled before treating hyperpigmentation.

When should you see a doctor?

  • Dark spots have not faded after 3 months, despite using sun protection and stopping skin picking.
  • Hyperpigmentation is spreading or darkening after introducing a new product — suspected contact dermatitis.
  • You are unsure whether you have dark marks, pitted scars, or both.
  • Inflammatory acne keeps recurring in the same area, leaving layered dark spots.

How BonBoz treats it

Prescription Topical Regimen

Doctor-prescribed tone-evening and anti-inflammatory actives, combined with broad-spectrum sun protection.

Learn about this method →

Chemical Peels

Controlled epidermal exfoliation to accelerate the clearance of superficial pigmentation over a treatment course.

Learn about this method →

Laser Toning (Pastelle)

Low-fluence Q-switched laser to break down deep pigmentation, designed for persistent slate-gray hyperpigmentation.

Learn about this method →

Inflammatory Acne Control

Preventing new post-inflammatory hyperpigmentation — the foundational step for all treatment protocols.

Learn about this method →

Cost guidance

Most cases of superficial hyperpigmentation only require prescription topicals and sun protection — making it a low-cost option. Chemical peels and laser toning are charged per session; the doctor will outline the estimated number of sessions following a skin analysis.

The final price follows the doctor’s recommendation after an in-person exam. A confirmed quote has no hidden extras.

Chân dung BS.Ths.CKI Kim Kha

BS.Ths.CKI Kim Kha

Aesthetic Dermatology

  • Graduated as a General Practitioner — Tay Nguyen University (2018)
  • Specialist Level I in Dermatology — Pham Ngoc Thach University of Medicine, degree awarded in 2025
  • Medical Practicing Certificate No. 009784/ĐL-CCHN — Issued by the Department of Health of Dak Lak Province on 15/10/2021
  • Over 8 years of experience in aesthetic dermatology practice (since 2018), including over 4 years of practice with an official Medical Practicing Certificate
  • Primary Specialization in Plastic and Reconstructive Surgery; Certificates in Dermatological Procedures & Minor Surgery, Microsurgery, and Lasers & Light Therapies in Dermatology
  • Certificates in Dermal Fillers, Botox, and Thread Lifts; Certificates in Emergency Resuscitation and Infection Control
  • Formerly practiced at the Aesthetic Dermatology Unit — Post and Telecommunications General Hospital (2019–2021) and Venus Sunrise Clinic (2022–2024) before joining BonBoz Clinic (2025)
  • Former lecturer in Aesthetic Dermatology Theory at Ana Aesthetic Training School (2018–2019)
  • Over 5,000 clinical dermatology cases treated
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Frequently asked questions

Does post-acne hyperpigmentation fade on its own?

Epidermal (superficial) hyperpigmentation usually fades over several months with proper sun protection and no picking. Dermal (deep) and layered hyperpigmentation fade very slowly and typically require clinical intervention.

Can I use over-the-counter dark spot creams?

Certain brightening actives in OTC products can help with superficial dark spots. However, unverified products may contain corticosteroids or mercury, leading to long-term skin damage—it is best to consult a doctor first.

Are red marks after acne considered hyperpigmentation?

No. Red or pink marks are dilated capillaries known as post-inflammatory erythema (PIE), not pigment; therefore, skin-brightening agents are ineffective. PIE requires a different approach and often just needs time along with gentle skincare.

How important is sun protection?

It is crucial. Without sun protection, virtually all other treatments are ineffective, and dark spots can become darker after laser or chemical peel treatments.

Do chemical peels thin the skin?

Superficial chemical peels administered under a doctor's protocol do not thin the skin. At-home peels with inappropriate concentrations are what cause skin damage.

Does laser toning weaken the skin?

Laser toning utilizes low energy delivered over multiple sessions. Excessive session frequency or overly high energy settings carry a risk of mottled hypopigmentation—which is why laser parameters must be calibrated by a doctor.

If I have both dark spots and atrophic acne scars, which should be treated first?

Typically, active inflammatory acne is controlled first, followed by scar revision; dark spots are addressed concurrently using topical treatments and sun protection, as scar procedures can also cause temporary post-inflammatory hyperpigmentation.

How long does it take to see dark spots fade with treatment?

Topical medications typically take 6–8 weeks to show noticeable improvement. Chemical peels and laser toning usually show visible results after 2–3 sessions. Outcomes vary depending on the depth of the pigment and individual skin characteristics.

Do I need to avoid certain foods to clear dark spots?

No specific food directly causes hyperpigmentation. What you must avoid are sun exposure, skin picking, and irritating products.

Can post-acne dark spots recur?

Once faded, dark spots do not return on their own; however, new inflammatory acne will generate new dark spots. Controlling acne is the key to preventing hyperpigmentation.

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