Dermatofibromas (Benign Fibrous Histiocytomas) By Denise M Aaron, MD, Dartmouth Geisel School of Medicine Reviewed / Revised Jan 2022 | Modified Sep 2022 View Patient Education Diagnosis Treatment Topic Resources Dermatofibroma Dermatofibromas are firm, red-to-brown, small papules or nodules composed of fibroblastic tissue.