It appears in the skin folds of the armpits, groin, and around the neck. It's not common, but an acanthosis nigricans rash can be itchy. Acanthosis nigricans is linked to increased insulin levels ...

People have been urged to lookout for an unusual sign in the armpit that could signal the UK’s most common cancer. According ...

Dark underarms may simply have to do with pigmentation and levels of melanin in the skin. But sometimes armpit discoloration ...

These include the pectoralis, or the chest muscles, the latissimus dorsi muscle, which stretches around the back to ... It can cause an armpit rash that becomes raw or cracks open, which can ...