My surgeon wants to operate on this and he says it's a pilonidal cyst, yet other doctors have said it's a pressure ulcer. No treatment has worked, but I want to be sure it's a cyst before I have surgery done, so I'd like opinions from others who have cysts, or have knowledge of them. The picture is below. It's not above my buttcrack like a lot of pilonidal cyst, but rather inside it. It's a constantly moist, flat red sore.