about three or four monthes later. i know that cold sores are a type of herpes but i want to know if this is any kind of std that i should be worried about spreading to anyone else. since it was only one blister and not like a multiple of spreading blisters around my face
on someone else, especially when you have an active cold sore, you could give them genital herpes type 1, which accounts for 30-50% of new genital herpes infections a year.
Its not considered an std, but it can be sexually transmitted. For more info on this, see the herpes forum.