I Keep Getting Boils On Buttocks.some R Huge..n Some Are

i keep getting boils on buttocks.some r huge..n some are small..they are recurring..i have left with marks of boils.n when the huge boil burst , blood come out from it.kindly advice me wt to do..i have this problem since 4 - 5 yrs nw my age is 25.kindly help..n doin home remedies like applying custard oil on it..how to remove boils marks..n how shud i prevent boil from coming