<unk>  and<unk> <unk>  cheilitis are thought to be hypersensitivity reactions to some antigen. Possible sources of antigens include ingredients in toothpastes, chewing gum, mints, pepper, or foods. Specifically, cinnamonaldehyde and cinnamon flavoring are often to blame. However, the exact cause in most is unknown.
Plasma cell gingivitis
Denture-related stomatitis
Occupational acne
Contact stomatitis
Nutritional deficiency eczema
Steroid rosacea
Noxzema
Contact granuloma