Summary

Psoriasis is a chronic multisystemic disease that can take on different clinical morphologies and can present both in classic locations and in less frequently affected areas. With this paper we aim to describe the forms of psoriasis with particular locations: palpebral, of the ear lobe, of the tip of the nasal pyramid, psoriasis gyrata, Blaschko-linear psoriasis, as well as psoriasis with particular involvement: Hallopeau acrodermatitis, reactive arthritis and psoriatic onycho-pachydermo-periostitis of the hallux.