When I decided to walk outside my home or when I do exercise or when I am walking exposing my skin to sun i get small round structure popping out all over my body and it vanishes within 20-30 min,it doesn't seem like a blister or rashes when I try it pop it is not hard and it feel like tissue under it and it is the same colour as that of my skin.when this happens my whole hand looks creepy.. Please somebody help me