Is psoriasis contagious? Psoriasis is not “ringworm” and is not contagious. The pain of psoriasis is something that many people are experiencing. Once a psoriasis patient is ready to go abroad, afraid of being mistaken for infectious diseases by the airport border control personnel to the hospital to issue a certificate. Experts say that psoriasis is not contagious. “Ringworm” refers to skin diseases caused by fungal infections, such as tinea capitis, tinea cruris, tinea cruris and so on, which are all contagious. Psoriasis, on the other hand, is mainly caused by immune and metabolic dysfunction as well as genetic defects, so it is not contagious even in severe cases.