The purpose of this study is to evaluate different treatment options for patients with skin vasculitis (also named cutaneous vasculitis). Patients with isolated cutaneous small vessel vasculitis, medium-sized vessel vasculitis (polyarteritis nodosa), or IgA vasculitis (Henoch-Schönlein purpura) can join this study. The frequently used treatments for skin vasculitis are colchicine, dapsone and azathioprine. Eligible patients will initially be randomized to receive one of the 3 medications under investigation for 6 months (stage 1). Subjects may remain on the drug for stage 2, or they may be randomized to one of the remaining drugs. The study will compare how effective these drugs are at treating isolated cutaneous vasculitis.

You may be eligible for this study if you meet the following criteria:

• Conditions: ['Primary Cutaneous Vasculitis', 'Cutaneous Polyarteritis Nodosa', 'IgA Vasculitis', 'Henoch-Schönlein Purpura']
• Age: 99 years or below
• Gender: All