solar keratosis. dry scaly patches of skin

actinic aging been birthmark blemish body bumps cancer care chemotherapy close corticosteroids crusty damage damaged dermatitis dermatologist dermatology detail disease dry epithelium hand have health human humans hyperkeratosis illustration itch keratin keratosis knot macro magnifier mark medical old palm patches peeling people phase rash recovery redness scaly skin solar specialist spot sun surgery that treatment tumor vector