Epidermal acanthosis Psoriasiform acanthosis 2025-04-24T15:58:55Z Psoriasiform hyperplasia Psoriasiform acanthosis Psoriasiform epidermis Psoriasiform epidermal hyperplasia Because of elongated rete ridges, this is different from common epidermal acanthosis. The etiology in cases with psoriasiform acanthosis is wide, such as: psoriasis, pustular psoriasis, Reiter syndrome, pityriasis rubra pilaris, parapsoriasis, lichen simplex chronicus, erythroderma, mycosis fungoides, chronic candidosis, Norwegian scabies, Bowen disease, clear cell acanthoma, lamellar ichthyosis, pityriasis rosea, acrodermatitis enteropathica, and secondary syphilis. In psoriasis, usually characterized by psoriasiform acanthosis, no significant hyperplasia can be seen in early lesions. Diagnosis is often made with other histological features and with clinicopathological correlation. A type of epidermal acanthosis characterized by regular elongated rete ridges.