The other day when I woke up, I noticed a big, re, hard lump on my penis shaft.  I didn't know what it was and I got scared. So I looked up what it may be and I think it may be a cyst. So I started using a hot compression on it a couple times a day. The swelling went down some, but not very much. When ever touch it it hurts. I don't know if it is a cyst, ingrown hair, or what. I hope it is nothing but please help.