and is associated with inflammation of the epidermis and dermis. This reaction is responsible for the appearance of well-circumscribed skin lesions (plaques), erythematous (reddish) and covered with silvery-gray scales. The causes of psoriasis have not yet been fully clarified but a role is certainly played by the immune system and genetics.
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The diagnosis of psoriasis is based on the appearance and distribution of the lesions. Treatment involves the use of emollients, topical drugs (vitamin D analogues, retinoids, tar, anthralin and corticosteroids), phototherapy and, in the most severe forms, therapies systemic (methotrexate, cyclosporine or biologics).
.Psoriatic plaques typically appear on the elbows, knees, scalp and lower back, but can also extend to the entire body.
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