Depigmentation: Loss of color (pigment) from the skin, mucous membranes, hair, or retina of the eye.
The color of the skin, mucous membranes, hair, and retina is due to the deposition of melanin, which is a coloring matter. Melanin is produced by specialized cells called melanocytes.
Other terms pertaining to pigment include pigmentation (the presence of pigment), hypopigmentation and underpigmentation (too little pigment), and hyperpigmentation (too much pigment).
- Depo-Provera contraceptive
Depo-Provera contraceptive: Injectable progestin (Depo-Provera) was approved by the U.S. Food and Drug Administration (FDA) for contraception in 1992. It is injected by a health professional into the woman’s buttocks or arm muscle every three months. Depo-Provera prevents pregnancy in three ways: It inhibits ovulation, changes the cervical mucus to help prevent sperm from reaching […]
An illness that involves the body, mood, and thoughts and that affects the way a person eats, sleeps, feels about himself or herself, and thinks about things. Depression is not the same as a passing blue mood. It is not a sign of personal weakness or a condition that can be wished away. People with […]
- Depression, dysthymia
Depression, dysthymia: A type of depression involving long-term, chronic symptoms that are not disabling, but keep a person from functioning at “full steam” or from feeling good. Dysthymia is a less severe type of depression than what is accorded the diagnosis of major depression. However, people with dysthymia may also sometimes experience major depressive episodes, […]
- Depression, major
A disease that interferes with the ability to work, sleep, eat, and enjoy once pleasurable activities. The signs and symptoms of major depression include loss of interest in activities that were once interesting or enjoyable, including sex; loss of appetite (anorexia) with weight loss or overeating with weight gain; loss of emotional expression (flat affect); […]
- Dercum disease
Dercum disease: A condition characterized by painful fatty tumors (lipomas) beneath the skin. The diseases tends to be associated with obesity and is about 5 times more frequent in females than in males. Onset of symptoms is generally in middle age. The fatty tumors are most often located on the trunk and limbs with sparing […]