NURS 1543 Chapter 13: NURS1543 - SKIN
3 Mar 2017
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General pigmentation - even skin tone throughout body, but darker in sun exposed areas. Freckles (ephelides): small, at macules of brown melanin pigment that. Mole (nevus): a proliferation of melanocytes, tan to brown colour, at or raised. Acquired nevi are characterized by their symmetry, small size (6 mm or less), smooth borders, and single uniform pigmentation. The junctional nevus is macular only and occurs in children and adolescents. In young adults it progresses to the compound nevi that are macular and papular. Intradermal nevus (mainly in older adults) has nevus cells in dermis only. Pallor (white) the red-pink tones from the oxygenated hemoglobin in the blood are lost, skin takes on the colour of connective tissue (collagen), which is mostly white. Common in acute high-stress states (anxiety or fear), because of the peripheral vasoconstriction from sympathetic ns stimulation. Vasoconstriction from exposure to cold and cigarette smoking and in the presence of edema.
