Suggest Remedy For Bumps And Scars Near Vagina

hi im 13 years old im 5ft 8 and i think i weigh 165 pounds i have a promble where my vagina would get bumps and scars from no were i try not to shave offten and when i shave i use near so i dont have to shave it just slips off. they offten be dry and fill with puss and blood how do i get rid of them and what cause them.