What should you know about perioral acanthosis nigricans?

The skin can look brown, grey or deeper than surrounding skin and may feel thicker or slightly rough. Acanthosis nigricans commonly affects folds such as the neck, armpits or groin, but a mouth-area pattern needs careful examination. Irritation, saliva, rubbing, post-inflammatory colour change and other causes of [Dark Patches On Skin](/symptoms/dark-patches-on-skin/) can resemble it. The appearance alone does not identify the cause.

Use a bland cleanser and moisturiser, avoid harsh scrubs and do not apply steroid or bleaching products around the mouth without advice. Arrange a dermatology assessment, particularly if the change is new, spreading or accompanied by similar darkened folds. Treatment may address an underlying metabolic or medication-related contributor; appearance-focused options can include [Topical Retinoids](/treatments/medical-dermatology/topical-retinoids/), [Chemical Peel](/treatments/aesthetic-procedures/chemical-peel/) or [Laser Toning](/treatments/laser-and-energy/laser-toning/) when appropriate.

Seek prompt review if the skin changes quickly, becomes painful, cracks, bleeds, forms a persistent sore or involves the lips or inside the mouth. Assessment is also warranted when darkening appears in several body folds, or when itching, scaling or a new medicine accompanies the change.

Ask whether the texture and distribution fit acanthosis nigricans or irritation, whether other skin folds should be checked, and whether medicines or metabolic health may contribute. Discuss gentle products and the risks of peels, retinoids or laser near the mouth.