blister lookalike in my arm, it doesn't itch or hurt at this time, I was cleaning a sponge on a container of water after taking my hands out the water, it became to itch on one of my arms, of course I scratch it but then I decided to leave it alone, so now I have one very little blister pimple lookalike after 3 days and I'm afraid it could be herpes or something related to that, please help.