Heat rash — also known as prickly heat, summer rash, or wildfire rash — occurs when the sweat gland ... under the skin with darker halos surrounding them. Heat rash often affects areas where ...

Nearby sweat glands and follicles ... have no way to escape. Large bumps formed deep in the skin, which can rupture, leaking smelly fluids into the soft tissues under the skin or to the outside.

People who have dark skin may present with darkened areas with small white or dark-colored bumps. Blocked sweat glands cause ...

Your sebaceous glands are under ... bumps appearing around the same time in the same area of the body. The bumps can be flesh-colored or yellowish. They do not itch or leak fluid. The bumps grow ...