Sounds like Keratosis Pilaris, also known as "chicken-skin" because the bumps look like "goosebumps". The keratin that is normally shed and sloughed off your skin is being backed up in your hair...
I guess,its an alergies and you can also should visit dermatologists about that, but for the meanwhile, you can help yourself with your skin by using lotions or such with Phytessence Wakame, Cynergy...