folliculosebaceous cystic hamartoma folliculosebaceous cystic hamartoma folliculosebaceous cystic hamartoma abbreviated as (fsch) is a rare cutaneous hamartoma consisting of dilated folliculosebaceous units invested in mesenchymal elements.: 676 it typically affects adults, have a predilection for the central face or scalp, with less than 1.5 cm dimension. clinically, the lesions are asymptomatic, rubbery to firm in consistency, and usually occur on or above the neck in (> 90%) of cases, histopathologically, fsch shares several similar features to sebaceous trichofolliculoma, but it is usually possible to differentiate these two tumors. folliculosebaceous cystic hamartomaadnexoblastic (folliculosebaceous) trichoid hamartomaspecialtydermatology