Hyperpigmentation

**Definition:** Excessive pigmentation of the skin, usually as a result of increased epidermal or dermal melanin pigmentation, hypermelanosis. Hyperpigmentation can be localized or generalized. The condition may arise from exposure to light, chemicals or other substances, or from a primary metabolic imbalance.

**Tree numbers:** - C17.800.621.430

**Synonyms:** - Hypermelanosis