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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Symptoms of Henoch-Schonlein Purpura. The classic symptoms of HSP are rash, joint pain and swelling, abdominal pain, and/or related kidney disease, including blood in urine. Before these symptoms begin, patients may have two to three weeks of fever, headache, and muscular aches and pains.