SKIN COLOR.

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Presentation transcript:

SKIN COLOR

Melanocytes Melanocytes = cells in stratum basale that produce differing amounts of the pigment*melanin Approximate # of melanocytes same in all ethnicities

There are 2 main types of melanin: EUMELANIN (brown/black melanins) are photoprotective PHAEOMELANIN (red/yellow melanins) may contribute to UV induced skin damage *Variations in hair and skin color are due to varying amounts of eumelanin and phaeomelanin produced by melanocytes

How does Melanin affect Skin and Hair Pigmentation? *While skin color can be affected by the environment – genetics plays a major role

SKIN COLOR PIGMENTS& CONDITIONS CAROTENE: Yellow-orange pigment Located mostly in STRATUM CORNEUM

HEMOGLOBIN: Red pigment Carries oxygen in red blood cells

JAUNDICE Skin color is yellowish Due to accumulation of bile in the blood (bile is made in liver)

ERYTHEMA Redness of skin (may be caused by sunburn) Caused by congestion of capillaries

VITILIGO Loss of skin pigment; immune cells attack melanocytes Appearance is pale patches of skin

CYANOSIS Bluish discoloration of the skin or mucous membranes caused by lack of oxygen in the blood

PALLID (PALLOR) Pale skin complexion Possible causes include: emotional response or anemia

ALBINO Lack of melanin pigment Melanocytes cannot produce melanin

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