Psoriasis https://medlineplus.gov/ency/article/000434.htm https://medlineplus.gov/ency/article/000434.htm Psoriasis MedlinePlus Encyclopedia: Psoriasis Encyclopedia: Psoriasis Psoriasis Psoriasis https://medlineplus.gov/ency/article/000434.htm https://medlineplus.gov/ency/article/000434.htm