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By Mayo Clinic staffUlcers caused by pyoderma gangrenosum are usually raw and tender. You may find you need to decrease your activities until the sores heal. Most often the ulcers leave scars.
One category of drugs used to treat pyoderma gangrenosum, called immunosuppressants, subdues your immune system. Using immunosuppressants for a long time may increase your likelihood of developing certain infections and cancers.