I found a 4mm diameter slightly raised blood blister like bug bite on my breast 3 days ago. Only tender if I push on the area. I could initially see a hole like site where a stinger couldf of gone in. I did not feel it but only noticed it in the mirror after a shower. I live in northern michigan and we have found ticks on our patio. Could it be a tick bite? There is no rash or bull's eye surrounding.