What should you know about melasma in underarm?

Melasma is a pigment condition that more often affects exposed facial skin. Underarm colour change may instead follow shaving, deodorant sensitivity, rubbing, inflammation, or a separate pigment disorder. It may appear as flat brown or grey-brown skin without pain or scaling. A clinician considers its pattern, texture, timing, medicines, pregnancy or hormonal changes, and products used on the area. Do not assume that every dark patch is melasma.

Pause fragranced products that sting and reduce rubbing from tight clothing. Shave gently with lubrication, avoid scrubbing or bleaching mixtures, and moisturise with a bland product. A dermatologist can confirm the diagnosis before choosing treatment. Depending on the cause, options may include prescription pigment care or a supervised skin brightening treatment; peels, microneedling, and laser toning require particular caution in an easily irritated fold.

Book a clinical assessment for a new, spreading, thickened, itchy, painful, bleeding, or rapidly changing patch. Seek prompt advice if the area becomes inflamed after a product or procedure. Assessment is also sensible when pigmentation affects both underarms or appears with changes elsewhere, because the pattern can help distinguish irritation from a broader skin or health issue.

Ask whether the colour and texture fit melasma, irritation, or another diagnosis; whether any current deodorant, hair-removal method, or medicine could contribute; and which treatment is appropriate for underarm skin. Ask how to test a product safely and what signs should make you stop it.