Whenever a room gets hot , when I lift something heavy , and when I workout , and sometimes just randomly I get this very painful and uncomfortable itch kind of like an insect bite all over my body . It s never my whole body at the same it s random but it mostly happens on my back , chest , face and head . It starts off as just itchy and uncomfortable but if I keep doing what I m doing say running it will turn painful . I used to workout all the time but this itch thing doesn t let me anymore