Asap help plzs plzs asap?

hello, my friend i rally scared of caching things shut as hiv /aids silly things like this know i have told my firend he will befien becuase there a person at are school who is like a tramp and has alot with ramdom people and he has a blister on the back of his finger and he toched my friend with is ok the back on the head i have told hoim that he will be fine plzs will you tell him that is will our not