melanosis
Abnormal tissue darkening
Melanosis is abnormal darkening of body tissues due to excessive deposits of melanin, the pigment that colors skin, hair, and eyes.
The condition can affect skin, mucous membranes, or internal organs.
In medicine, melanosis appears in various specific conditions: melanosis coli describes darkened colon lining, often from laxative use.
Brown-black biological pigment
- melanocytesPigment-producing skin cells
- hyperpigmentationLocalized skin darkening condition
- colorationSurface hue arrangement
- pigmentedHaving color added
chromatophores · discoloration · darkening · biosynthesis · tyrosine · chromophores · depigmentation · pigment
Tissue sample for diagnosis
- histopathologyDisease study through tissue
- lesionArea of pathological change
- neoplasiaAbnormal tissue proliferation
- carcinomaEpithelial malignant tumor
dysplasia · malignant · benign · precancerous · metastasis · tumor · adenoma · cytology
Patchy facial skin darkening
- lentiginesPigmented skin lesions
- frecklesPigmented skin spots
- sunspotsDark patches on star
- age spotsPigmented marks from aging
nevus · birthmark · mole · dermis · epidermis · photoaging · sunburn · complexion
eumelanin
Brown-black biological pigment
- melanocytesPigment-producing skin cells
- hyperpigmentationLocalized skin darkening condition
- colorationSurface hue arrangement
pigmented · chromatophores · discoloration · darkening · biosynthesis · tyrosine · chromophores · depigmentation · pigment · hue
biopsy
Tissue sample for diagnosis
- histopathologyDisease study through tissue
- lesionArea of pathological change
- neoplasiaAbnormal tissue proliferation
carcinoma · dysplasia · malignant · benign · precancerous · metastasis · tumor · adenoma · cytology · hyperplasia
melasma
Patchy facial skin darkening
- lentiginesPigmented skin lesions
- frecklesPigmented skin spots
- sunspotsDark patches on star
age spots · nevus · birthmark · mole · dermis · epidermis · photoaging · sunburn · complexion · tan