have a rash that stops where my waist line ends and continues primarily through the same area where my boxer shorts contact my skin; continues slightly posterior along buttock and very little down the front of my thighs; no involvement on face, chest, feet, palms etc.. was previously in a very hot environment but the rash does not itch. it consists of many small red bumps that seem similar to miliria rubra / sweat rash. had oral sex contact with woman of unkown history one month ago. have no hiv symptoms yet (fever, fatigue, tec) not completely sure if acute hiv rash would be this localized and within an area i described that seems to follow the skin contact with my briefs. not sure how similar acute hiv rash resembles heat rash. Would like you thoughts on this.