Acanthosis nigricans: It is a brown to black, poorly defined, velvety hyperpigmentation of the skin usually present in the posterior and lateral folds of the neck, the axilla, groin, umbilicus and other areas.
Lawrence-Seip syndrome: Lawrence-Seip syndrome is a relatively uncommon condition involving generalized loss of skin fat that is acquired rather than congenital as in Berardinelli-Seip Syndrome. Patients can also develop diabetes mellitus and other problems. The loss of skin fat tends to occur during childhood or adolescence and is often triggered by infections such as measles and hepatitis. The diabetes tends to occur after fat loss begins. The limbs and face tend to be the most affected.
Lipodystrophy: A rare group of disorders that can be acquired or inherited and involves adipose tissue abnormalities. The disorder is characterized by varying degrees of loss of body fat. The three forms of the condition are: total lipodystrophy, partial lipodystrophy and localized lipodystrophy.