About 3 months ago a had a deep cyst which left a slightly raised red, circular scar. A couple days ago it started getting larger, looking more like a pimple. Today it just kept getting bigger and by the time I got home it was pretty large and it looked like it might have pus in it so I attempted to extract it but nothing came out but blood. I didn't squeeze too much but now the are around is is highly inflamed and the whole thing is about the size of a dime. This worries me as it seems that if there is anything in is, its really deep under the skin. I would like to know what I can do no reduce the swelling and why the cyst randomly came back after 3 month. Also, would it be safe if I got a coritsone shot, or would it leave a scar since I picked at it? Please help I'm very concerned! Thank YouH