 [ Symptoms ] my boyfriend has a rash on his arm that is spreading that is itchy and burning what could it be  he did inform that he had someone who has the same or looks like the same kind of rash wash his clothes and when he got them back was when the flare up occurred he has been putting calamine lotion and hydrocortisone cream on the area but it does not seem to be helping he is also in an environment where there is no air and he is constantly hot and sweaty [ Disease ] as much as i would like to help you it would not be possible for me or any medical professional to diagnose your boyfriend is skin eruption based on your vague description