For acne, 20% is the prescription acne cream, 15% is the rosacea gel also used for acne, and 10% is the gentler starter. For dark marks, 20% and 15% have clinical support for fading pigment, while 10% fits mild uneven tone. Azelaic acid, a leave-on topical drug or cosmetic, fights both issues in one step.
Breakouts leave dark marks because inflammation triggers extra melanin, the brown skin pigment. People with medium to deep brown skin keep these marks longer. Choice comes down to diagnosis, pigment severity, and tolerance.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What each strength is approved for
- How it fights pimples and dark marks at once
- What the dark-mark studies found
- Which strength fits and what to watch
What each strength is approved for
According to the DailyMed drug label, 20% cream sold as Azelex is FDA-indicated for mild-to-moderate inflammatory acne vulgaris, meaning red, tender infected bumps DailyMed label. That prescription status separates it from lower-strength cosmetic products. A clinician decides its use after diagnosing inflammatory acne.
Prescription 15% gel and foam sold as Finacea are FDA-indicated for rosacea papules and pustules under FDA labeling, and clinicians also use them off-label for acne. Over-the-counter 10% is not an FDA-approved acne or rosacea drug, and GoodRx describes it as marketed for brightening, uneven tone, and mild post-acne marks. Think prescription for disease treatment and 10% for milder cosmetic care.
How it fights pimples and dark marks at once
The MDPI journal Pharmaceutics review explains antibacterial action against Cutibacterium acnes, the pore bacteria linked to acne, plus anti-inflammatory and keratolytic effects Pharmaceutics review. Keratolytic means it loosens dead skin, and comedolytic means it helps unclog pores. Together these actions calm red bumps and reduce new clogs.
The same review describes competitive inhibition of tyrosinase, the enzyme that drives melanin formation. Less tyrosinase activity means less new brown pigment in the mark. This dual action matters because one product can treat active breakouts and residual color.
What the dark-mark studies found
A 24-week multicenter randomized double-masked trial in darker-skinned patients with facial hyperpigmentation found greater pigment decrease with 20% cream than vehicle, by both investigator scale and chromometer, a color-measuring device. The Cutis study summary reports significance by both measures. It supports prescription strength for established facial pigment.
A 16-week baseline-controlled study of 20 adults with Fitzpatrick types IV to VI, meaning medium to deep brown skin, tested twice-daily 15% gel for acne and post-inflammatory hyperpigmentation, meaning dark marks left after pimples study record. The Journal of Drugs in Dermatology study shared via ResearchGate found reductions in both lesions and marks. Its limits are small size, short term, and no vehicle comparison.
Which strength fits and what to watch
American acne guidance summarized in a 2023 systematic review conditionally recommends azelaic acid as added treatment, especially for Fitzpatrick types IV or greater with hyperpigmentation and in pregnancy when retinoids are contraindicated. Mild tone concerns without many red bumps point toward 10%. Frequent inflamed bumps or stubborn brown marks point toward asking a clinician about 15% or 20%.
The Drugs.com professional monograph lists common early burning, stinging, tingling, itching, dryness, and peeling. It also flags rare hypopigmentation, meaning unwanted lightening, for monitoring in dark complexions. Systemic absorption remains negligible.
- Start low if skin burns easily or marks are light brown and few
- Ask a clinician about prescription strength for many red bumps plus dark marks
- Ask about azelaic acid if pregnant and retinoids are off-limits
- Pause and call prescriber for spreading pale spots, severe peeling, or swelling