Psoriasis is a peculiarity of skin development. The weakness is in you all the time but the actual disease can come and go. The healthy cadence of changes in your skin structure, from its foundations to its surface, is disrupted as in eczema but in the opposite direction: cells grow too fast in both diseases but in psoriasis they heap up in silvery crusts and usually stay dry. This mainly affects skin that grows fast normally and forms crusts to resist wear, such as your scalp and the rough hardened skin on the outside of your joints. When you scalp is severely involved it can cause temporary hair loss. It is one of the commonest skin diseases in Europe.
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