Thursday night a small red mark was noticed on my butt. Saturday it started itching throughout the day. Red mark about the size of a half dollar & a bit raised like a welt. Sunday still itching & possibly because of itching there was a small cluster of clear liquid filled blisters. Skin bright red still about a half dollar in size. Feels great to scratch then it hurts after doing so. Benadryl helps with the itching but makes me drowsy. Am thinking it s an allergic reaction to a mosquito bite but never had this occur before.