“…The most common reports are of granuloma annulare [ 74 , 75 , 76 ] and other granulomatous processes, including necrobiosis lipoidica [ 77 , 78 ], sarcoid [ 79 ], and elimination of suture material [ 80 ]. Other reports include perforating pseudoxanthoma elasticum [ 81 , 82 , 83 ], pilomatrixoma [ 84 , 85 , 86 ], sialolithiasis [ 87 , 88 ], lichen nitidus [ 89 , 90 ], and osteoma cutis [ 91 ]. Unusual reports of perforating cryocrystalglobulinemia in the context of multiple myeloma [ 92 ] and perforating ochronosis [ 93 ] again underscore the importance of a categorical approach over rigid adherence to previously published lists.…”