Hi I had what was a small cluster of bumps on the lower part of my buttock and its now kin of blistered slight red and seems to be letting out a very small amount of greenish puss. I noticed for a day my left side of my groin area was slightly soar and that the same side the rash has occurred. I thought the tenderness was possibly related to running and exercising but now am not sure. The rash has been there for almost a week.. Any ideas??