Pseudoxanthoma elasticum with a knuckle pad on the thumb.
D000328:Adult; D001323:Autoantibodies; D001327:Autoimmune Diseases; D001706:Biopsy; D004547:Elastic Tissue / Q000473:pathology; D006801:Humans; D008297:Male; D011561:Pseudoxanthoma Elasticum / Q000150:complications* / Q000276:immunology / Q000473:pathology; D012871:Skin Diseases / Q000150:complications*; D013933:Thumb
D001323:Autoantibodies