HSP presents primarily as gastrointestinal disturbances, joint pain, and purpura or skin hemorrhages. Symptoms include stomach pain, nausea, vomiting, and painful and swollen joints. The telltale symptom of the disease is the purpura, the rash on the skin caused by leaking blood vessels. Also called blood spots, this sign can appear as small red dots or larger, darker splotches resembling bruises. If the kidneys are affected, individuals may experience blood in their urine.

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