Self-abuse may refer to:

Self-harm, the intentional, direct injuring of ones own body without suicidal intentions
Self-destructive behaviour, patterns of behaviour to inflict metaphorical or literal harm on oneself
Self-inflicted wound, harming oneself without psychological problems to take advantage of being injured

See also
Algolagnia, deriving sexual pleasure and stimulation from physical pain
Abuse § Self-abuse
Violence § Self-directed violence
In a few cases a sore mouth can develop, and if so pain is sometimes made worse by toothpastes, or hot or spicy food. The lesions can extend to involve the palate.Plasma cell cheilitis appears as well defined, infiltrated, dark red plaque with a superficial lacquer-like glazing. Plasma cell cheilitis usually involves the lower lip. The lips appear dry, atrophic and fissured. Angular cheilitis is sometimes present.Where the condition involves the tongue, there is an erythematous enlargement with furrows, crenation and loss of the normal dorsal tongue coating. Causes
Plasma cell gingivitis and plasma cell 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. Diagnosis
Histologically plasma cell gingivitis shows mainly plasma cells. The differential diagnosis is with acute leukemia and multiple myeloma. Hence, blood tests are often involved in ruling out other conditions. A biopsy is usually taken, and allergy testing may also be used. The histopathologic appearance is characterized by diffuse, sub-epithelial plasma cell inflammatory infiltration into the connective tissue. The epithelium shows spongiosis. Some consider that plasmoacanthoma (solitary plasma cell tumor) is part of the same spectrum of disease as plasma cell cheilitis. Classification
Depending upon the site of involvement, this condition could be considered a type of gingivitis (or gingival enlargement); a type of cheilitis; glossitis; or stomatitis.