Possible complications of pyoderma gangrenosum include infection, scarring, uncontrolled pain, depression and loss of mobility.
Prevention:
You can't totally prevent pyoderma gangrenosum. If you have the condition, try to avoid injuring your skin. Injury or trauma to your skin, including from surgery, can provoke new ulcers to form. It may also help to control any underlying condition that may be causing the ulcers.
Diagnosis:
Your doctor will talk with you about your medical history and conduct a physical exam. No test can confirm a diagnosis of pyoderma gangrenosum. But your doctor may order a variety of tests to rule out other conditions that may have similar signs or symptoms. These may include blood tests, a skin biopsy and other tests.
Your doctor may refer you to a specialist in skin conditions (dermatologist).
Courtesy: Mayo Clinic