Excoriations may be caused by scratching, scraping, or chemicals. In cases in which excoriation results from the skin being scratched by the patient due to the irritation of the skin, linear crusts and erosions may result. This can happen when, for example, the patient has scratched itching eczema or dermatitis while asleep.
Excoriations are included in this section because this is a type of skin lesion. Study of skin lesions is required as part of many courses in aspects of health and holistic therapies, especially bodywork therapies.