Armpit rashes can be caused by ... It's usually not itchy and may look like rough, discolored, reddish-brown bumps or patches. On darker skin, the rash may look lighter than the unaffected skin.

Folliculitis typically causes small red bumps overlying the hair follicles on your skin that may be painful or itchy. This can ... areas of skin tend to be the armpits, groin, and buttocks ...

Diabetes can lead to various skin conditions, with early signs including shin spots, darkened patches in body creases, and ...