I've had this problem as far as i can remember myself. Anytime i start sweating, my scalp feels really itchy. Face not so bad, but also. I don't get any allergic reactions or something, i mean no redness etc. But all i want to do is scratch my head and face. It always annoying me, but i never really thought what can i do for that. It not depend on any particular skin care products i use also. Anyone else have this problem? What can i do about that? Thanks.