Darkening of tissues

Darkening of tissues is a symptom that occurs when tissues in the body become discolored and darker in color. It can occur in any part of the body, including the skin, eyes, and mucous membranes. It is usually caused by an increase in the amount of melanin in the tissue, but can also be caused by other factors such as inflammation or disease. Darkening of tissues can start as a patchy discoloration and eventually become more uniform in color. It can be accompanied by other symptoms such as itching, burning, and swelling.