ahiddensky

im 17yrs old and ive never had sex. for awhile ive had these crimson color rashes on my leg near where my leg connects to my groin. recently theyve looked a purple-ish color more have appeared, and some have gotten bigger. a few days ago i noticed a bump which resembles a skin tag on my groin, near my leg. today in school the area where the bump is has been hurting and when i got home, i noticed there was a purple rash/mark under the bump and there was a small amount of puss around it. i dont know what it is but im starting to get concerned. i havent told anyone about it. can anyone help?