Blue coloured skin in psoriatic arthritis.
Jajic
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D015535:Arthritis, Psoriatic / Q000150:complications* / Q000473:pathology; D001172:Arthritis, Rheumatoid / Q000150:complications / Q000473:pathology; D006801:Humans; D007596:Joints / Q000098:blood supply / Q000473:pathology; D010808:Physical Examination; D010859:Pigmentation Disorders / Q000150:complications* / Q000473:pathology; D012880:Skin Pigmentation