Good evening. About 3 years ago I suddenly developed a painful cyst on my face that formed quickly. It drained after a few weeks, then spread rapidly to other parts of my face. It took about 6 months to heal. About 2 years later it came back, again, staying for months. This is the third time. Each time it takes months to heal and leaves deep scars. When I first had it I saw a dermatologist about 7 times who ran a million tests, took skin samples, and could not figure out what it was.