Psoriasis is a common, long term skin condition that comes and goes throughout your lifetime. It happens due to immune system over-activity. 

Psoriasis is not infectious; therefore, you cannot catch it from someone else. It does not scar the skin, although sometimes it can cause temporary changes of skin colour. Although psoriasis is a long-term condition there are many effective treatments available to keep it under good control. 

Psoriasis affects about 1 in 50 people. It may occur at any age from puberty onwards, but rarely can affect younger children.  

Here is how it has affected Mark on his skin journey.