Human skin color is determined by the interaction of melanin, carotene and hemoglobin. Storage of water, fat, glucose and vitamin D is also a function of the integumentary system, according to the AAD.
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Who gets Henoch-SchÃ¶nlein Purpura (the âtypicalâ patient)? Usually, HSP affects a child shortly after an upper respiratory infection has resolved. HSP is the most common form of vasculitis in children, with an annual incidence on the order of 140 cases/million persons. The mean age of patients with HSP is 5.9 years.