Biopsy of the thumb skin lesions revealed a band-like lymphohistiocytic infiltrate in papillary dermis and perivascular and periappendage inflammatory infiltrate in the dermis.

• 由皮肤病灶处的切片可见在真皮乳头处有带状的单核球细胞浸润且在真皮层处可见血管及附件周围有许多发炎细胞。