How effective are topical retinoids for acanthosis nigricans?

Acanthosis nigricans often creates darker, thicker, velvety skin in folds such as the neck, armpits or groin. A retinoid can encourage more orderly shedding of surface cells and may make the area feel smoother. Colour change can be slower and less predictable than texture change. Irritation, dryness or burning can make dark marks look more noticeable, especially in deeper skin tones. The condition can be associated with metabolic or hormonal factors, so treating the skin alone may leave the trigger unchanged.

Use only the product and strength recommended for you, applying a thin layer to clean, completely dry skin. Begin as directed, often with spaced applications, and use a bland moisturiser to reduce dryness. Avoid scrubbing, friction and hair-removal products on the same area unless your clinician says they are suitable. Protect exposed skin from sunlight. Arrange a review if the area becomes sore or if there is no meaningful change after the agreed trial; your clinician may look for an underlying cause or discuss another approach. Learn more about [Topical Retinoids](/treatments/medical-dermatology/topical-retinoids/).

Book a medical assessment if the darkening is new, spreading quickly, unusually itchy, painful or accompanied by other skin changes. Seek prompt advice for marked swelling, blistering, open skin or a severe reaction after application. A clinician should also assess widespread or sudden changes, because the appearance can have causes beyond surface pigmentation.

Ask what may be contributing to the skin change, which retinoid strength and schedule fit your skin, and how irritation will be managed. You can also ask when to review progress, whether another treatment would better target thickness or colour, and whether any health checks are appropriate.