Psoriatic skin tries to repair itself by generating new cells, but it does so seven times as fast as healthy skin.

FORBES: Skin Deep

But milk is being hyped as a key ingredient in some new fast-selling skin and bath products from Caswell-Massey, Avon, Almay and other companies.

FORBES: Getting Milked

These cells pile up on the surface of the skin when the body cannot shed them fast enough, leading to unsightly patches of raised red skin covered by a flaky white build-up.

BBC: Vaccine 'switches off' psoriasis