Basal cell hyperplasia (BCH)

 

BCH looks dark at low power because of scant cytoplasm. Usually small, round glands are surrounded by concentric connective tissue.

 

Some glands are solid. Others have a small lumen that may be eccentric. The basal cell layer is prominent and stratified. The basal cells are round and may have a small nucleolus. Basal cell markers are always strongly positive.