Bump/Dent in my lower back?

so i have no idea when this appeared, a few years ago maybe, but i have this dent in my lower back, like really low down and its mildly painful, though it seems to be closing up now. Coupled with it is a bump that appears sometimes that is a lot more painful and it is filled with strange smelling puss. I can only... show more so i have no idea when this appeared, a few years ago maybe, but i have this dent in my lower back, like really low down and its mildly painful, though it seems to be closing up now. Coupled with it is a bump that appears sometimes that is a lot more painful and it is filled with strange smelling puss. I can only describe it as a kind of car smell, like gasoline and leather. its really weird. Does anyone know what this could be? im too embarassed to go to a doctor about it, i feel like it might be an issue with my spine or urinary tract though.
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