Digital mucous cysts presenting as numerous translucent nodules in the right fifth finger

Digital mucous cysts is a common benign skin disease usually present as solitary or a few soft, translucent to slightly bluish nodules. Here, we report the case of a 90-year-old male patient with numerous translucent nodules on his right fifth finger. Although he had one of them drained, they recurred afterward. Skin biopsy was done on the ventral side of the fifth distal phalange, and clear viscous fluid was noted during the procedure. The surrounding bulging nodules became flattened after milking. By hematoxylin and eosin stain, the section showed a cystic lesion in the dermis. The cyst wall was devoid of a true lining, consisting of eosinophlic, compact, slightly hyalinized collagen. In the cystic space, there was only a small amount of mucin. He was therefore diagnosed with multiple digital mucous cysts. We treated him with intralesional steroid injection and compressive dressing. Two weeks later, however, the skin lesions recurred despite the treatments.