noun. Excess pigmentation, especially of the skin.

noun. An excess of pigmentation.

noun. The darkening of an area of skin or nails, caused by increased melanin.

noun. unusual darkening of the skin

"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."

physical condition  physiological condition  physiological state  

burn  sunburn  suntan  tan  

brick-red  eosinophilia  glop  gunk  leukopenia