Alright, long story short at school a bout 4 days ago I seem to have sit strangely on one of those flat hard circular seats in the cafeteria, It was simply sitting flat on the seat but it was kind of like the bone where my rear-end is pinched my skin with the seat and it immediately hurt a lot, after that it felt fine, but soon a bump that was painful to touch *especially by sitting* appeared. after about 2 days it grew and became swollen quite a bit and now it's become difficult to sit even if i try sitting only on one side or on my legs. It's really become difficult but thankfully it's the weekend. Would anyone happen to know a remedy or perhaps at least how long it'll probably last?