Acanthosis nigricans or dark neck is a condition in which your neck is noticeably dark. The affected skin becomes thick and velvety. Medical attention is required to treat the condition.

Skin Pigmentation Disorder Acanthosis nigricans refers to a fairly common skin pigmentation disorder. The most notable indication of this condition is dark skin patches with…

Endoscopy An endoscopy is a procedure where the inside of your body is examined using an instrument called an endoscope. An endoscope is a long, thin, flexible tube that has a light source and camera at one end. Images of the inside of your body are relayed to a television screen. Endoscopes can be inserted into the body through a natural opening, such as the mouth and down the throat, or through the bottom. An endoscope can also be inserted through a small cut (incision) made in the skin…

Author(s): Katz, Aaron S.; Goff, David C; Feldman, Steven R

Genetic illnesses, health conditions, or infections cause your skin to react in unusual ways. Learn about these conditions and what they can do to skin.

Having diabetes can make you more likely to get ulcers and sores -- on your feet and other parts of your body. Find out what helps prevent them.