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yt:quality=high psoriasis vulgaris allergy autoimmune disease conditions dermatology immune system mechanism medicine plaque psoriasis problems science skin rash T cells types of psoriasis symptoms causes pathology treatment genetics inherited disorders steroid creams triggers guttate psoriasis inverse psoriasis infectious is psoriasis contagious genetic loci PSORS ocular psoriasis psoriatic arthritis phototherapy UV light photo therapy systemic drugs