n. The darkening of an area of skin or nails, caused by increased melanin.
The Century Dictionary and Cyclopedia
n. An excess of pigmentation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. unusual darkening of the skin
Word Usage
"Heating the melanin in the skin with a laser like this also led to hypo pigmentation and hyperpigmentation, which is the darkening or lightening of the skin."