I had sex the other day and the guy fingered me a lot. I was kind of dry and now I have a single bump directly under my clitoris on the right side of my labia (which is where he was rubbing the most). It hurts like a blister from ill fitting shoes would, doesn't have any abnormal coloring, the base doesn't stand out in any way like normal stds would etc. It itches a little bit as well. Could it be a blister from irritation or something way more serious?