<unk>  is an erythematous (red), desquamatous (shedding) and ulcerated appearance of the gums. It is a descriptive term and can be caused by several different disorders.
Desquamative gingivitis
Denture-related stomatitis
Contact stomatitis
Aphthous stomatitis
Herpetic gingivostomatitis
Byssinosis
Angular cheilitis
Actinic cheilitis