49, 5 9 , 170 lbs. DVT in the past. I have a painful lump on the inside of my lower buttock. I can t see it, only feel it. When I m on antibiotics, the pain and infection symptoms disappear. When I m not on antibiotics, the symptoms come back. I can only feel this lump when I squatting. Been to many doctors, they are unable to feel or see it.