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Although it is clear that psoriasis skin disease is not contagious , there are still many things to search related to this problem. Psoriasis skin disease cannot be passed on to the other person by sharing same swimming pool or having sexual intercourse. Scientists have found out that immune system and genes play an important role in this condition. It is possible that behind the skin problem related to psoriasis can be some genes malfunctioning. Research has also shown that causes for psoriasis vary. The psoriasis causes include genetic predisposition. It is not that if a person has got psoriasis genes, must suffer from the condition. It is actually the right mix of the genes and environment that will trigger psoriasis. Scientists have found that many people who experienced psoriasis skin disease had gone through these situations or these factors were common before getting the problem. The underlying causes of psoriasis are likely related to following factors and they may be considered as predisposing factors: