I've had a fewwhite spots on my arms for years - we call it white spot, not sure if its the proper name or not. They were worse when I lived in the islands. From what I can remeber is a fungal thing, but not al all harmful. The best thing for it was selsun shampoo. But as it's not a problem, I haven't bothered. However, check it out at the chemists or something just to be sure. HTH