Angular Cheilitis

Angular cheilitis is a chronic inflammatory condition of the corners of the mouth. Usually associated with a fungal or bacterial infection, those affected may also have thrush (oral candidiasis). The areas are generally slightly painful. The condition can last from days to months.
Angular cheilitis can be found in the corners of the mouth. A patient with angular cheilitis may notice:

Cracking and fissuring of the corners of the mouth, with redness
Ulceration
Drainage of pus
Tissue softness and tenderness