Hi there, My partner returned from a 2 day music festival (sunny weather / camping involved) 2 weeks ago. On her last day and up to now, she has been displaying small raised red bumps - a few around her ankles and knees, a few around her elbows but a small rash/a lot of these bumps on the back of her upper arm (near her armpit). I am worried as to what this could be, as the symptoms started showing pretty quickly. She had recently changed her washing powder, and still continues to use this, but will be changing back to the old one as a test. Thanks, AAAAA.