There are various reasons for underarm skin discoloration. Popular reasons are pseudoacanthosis nigricans (due to diabetes, PCOS, obesity), contact irritant dermatitis to deodrants and perfumes, ...

3 Other similar conditions include epidermal nevi, granular parakeratosis, omphalith, seborrheic keratosis, epidermolytic hyperkeratosis, pseudoacanthosis nigricans, and tinea versicolor.

There are various reasons for underarm skin discoloration. Amongst the popular reasons are pseudoacanthosis nigricans (due to diabetes, PCOS, obesity), contact irritant dermatitis to deodrants and ...