A strange lump appeared on my buttocks last month. At first, I thought it was just a heat boil, so I used a pain relief patch until last week. It seemed to heal up, so I stopped using the patch, but now the lump is back. What could this be, and should I be worried about it?

I'm not capable of viewing images, but based on your description, I strongly recommend consulting a doctor or dermatologist to examine the lump and determine the cause, as it could be a sign of an underlying condition, such as a cyst, abscess, or skin infection.