Some tumor cells contain brown melanin pigment. Gross Freely movable dermal subcutaneous nodule. Cut section reveals a white, cheesy and malodorous cyst contents. Case 11 Dermatofibroma Gross Frim nodule which is brown or flesh-colored and dimples with central compression. The overlying epidermis is acanthotic and hyperpigmented along the basal layer.
Fibrosis is increased in the dermis.
Case 11 Dermatofibroma HP Thick collagen bundles are intermixed with spindled nuclei of fibroblasts. Case 12 Keloid Gross Large, firm indurated nodule. Thinned epidermis with loss of rete ridges. Case 13 Neurofibroma Gross Flesh colored soft nodules. If multiple, think of neurofibromatosis Case 13 Neurofibroma MP Solid proliferation compressing overlying atrophic epidermis.