A lump on the finger knuckle joint can happen for many reasons, ranging from an inflammatory condition to an infection. In rare cases, a bump or lump on the finger knuckle joint can be due to a tumor.

Digital mucous cysts (DMCs) are relatively common benign cysts of the digits, occasionally involving the nail matrix and nail fold. First described as “synovial lesions of the skin” by Markin and ...

A 32-year-old man with a history of eczema presents to the dermatology clinic with a cluster of “hard, rough bumps” on his right index finger. On physical examination, the lesion appears ...