I'm in my first month of a two month prescription of Tetracycline to treat painful diabetes-related cysts that I developed in my underarm and and some other areas of my body. I can say that it is working well to clear up the condition, though I have never been on an antibiotic for so long, and it's a drag to be on this stuff in the middle of summer when I really want to be in the sun and at the beach.
