SARA ALLISON is a trichologist with a clinic in Harley Street, London (hairtoday moretomorrow.com). She is also the author of Hair Today More Tomorrow: How To Keep Your Hair On…The Ultimate Guide For Women (£12.97 paperback, £9..97 K97 Kindle; b; both ava la vailable online ne)
The skin of the scalp is no different to anywhere else on the body. It goes through the same natural process of skin renewal in which dead cells are shed to be replaced by new skin cells.