hello i am a 16 year old boy. i started noticing these red bumps around the crook of my right arm towards the end of winter. i payed no attention to it thinking it would go away. in a week or 2 it eventually turned into white circular/oval white spots. these spots are on both my upper right and left arm and very few spots on my forearms. some of the spots are very tinted and are hard to see. i have had these spots for about 4 months and they have not spread. initially when i had the red bumps, my skin itched, but when the skin turned white my skin didnt itch anymore. the spots turn red if they are in the sun for too long. i am also constantly playing sports and do not go a day without sweating. can anybody tell me what this condition is.