We herein report a 4-year-old boy with infantile digital fibrornatosis developing on the distal & middle phalanx portion of the right index & ring fingers, and the middle phalanx portion of the right middle finger, which started at the age of 5 months after birth. Biopsy specimen taken from the right middle finger showed the proliferating collagen bundles and fibroblasts in the dermis and eosinophilic cytoplasmic inclusions within the fibroblasts. Although we attempted to treat tbe patient with intralesional injection of triamcinolone acetonide suspension and cryotherapy 5 times biweekly, there was no signifit effect.