Fig. 1From: Role of diagnostic imaging in psoriatic arthritis: how, when, and whya, c Pitting and ridging of the nails is a common sign of psoriasis and also in psoriatic arthritis. b Dactylitis, uniform sausage-like swelling of the whole digit either finger or toe, is a hallmark clinical feature of PsA. d Umbilicus, as well as behind the ears and at the top of the natal cleft are hidden areas for skin psoriasisBack to article page