Black hairy tongue and angular cheilitis in a male patient. Black hairy tongue is a harmless condition causes small bumps on the tongue to elongate with black or brown discolouration. This case was caused by smoking. It is managed by improving oral hygiene including scraping or brushing the tongue. Angular cheilitis, also known as angular stomatitis, is an inflammatory lesion at the labial commissure, or corner of the mouth. The condition manifests as deep cracks or splits. In severe cases, the splits can bleed when the mouth is opened and shallow ulcers or a crust may form.