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Pyoderma gangrenosum is a rare, inflammatory skin disease where painful pustules or nodules become ulcers that progressively grow. Pyoderma gangrenosum is not infectious.Treatments may include corticosteroids, ciclosporin, infliximab, or canakinumab.The disease was identified in 1930. It affects approximately 1 person in 100,000 in the population. Though it can affect people of any age, it mostly affects people in their 40s and 50s.

There are two main types of pyoderma gangrenosum:

the 'typical' ...