Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Henoch-Schnlein Purpura ?
    ### Response:
    A diagnosis of HSP is suspected when a person has the characteristic rash and one of the following:
                
- abdominal pain  - joint pain  - antibody deposits on the skin  - hematuria or proteinuria
                
Antibody deposits on the skin can confirm the diagnosis of HSP.
    