What is infantile digital fibromatosis?

Infantile digital fibromatosis is a rare tumor composed of myofibroblasts that develops in infancy and early childhood on the fingers and toes. The primary lesion is a skin-colored or red tumor usually located on the lateral or dorsal surface of the digit. Histologically, they consist of myofibroblasts with characteristic eosinophilic cytoplasmic inclusions composed of actin filaments.

Heymann WR: Infantile digital fibromatosis, J Am Acad Dermatol 59:122–123, 2008.