Crescentic osteolytic defect: Keratoacanthoma is characterized by a crescentic osteolytic defect under radiation. Keratoacanthoma, also known as sebaceous mollusc or pseudocarcinomatous mollusc is a proliferative lesion of the keratinized epithelium of the hair follicle. It is most common in males, and is more prevalent in middle-aged and elderly people. So what are the preventive measures for crescentic osteolytic defects? The following will be introduced to you. Crescent-shaped osteolytic defect preventive measures 1, do not drink alcoholic beverages for a long time, quit smoking and alcohol addiction, do not eat excessive pickles, acid, spicy stimulating food, forbidden to eat moldy food, suffering from chronic pharyngolaryngitis is even more important to develop good dietary hygiene habits, such as less meat and more vegetarian, eat more fresh fruits and vegetables. 2, cold season indoor temperature and humidity, pay attention to air circulation. Room temperature at 20 ℃ is appropriate, do not sleep at night, do not cover too much bedding, to avoid high temperature or excessive dryness, resulting in discomfort in the throat. Don’t sleep with the wind, take a rest after strenuous labor, and don’t take a cold shower right away. Those who have acute pharyngitis caused by cold and flu should drink more hot water or ginger soup to sweat and increase urinary excretion. Pay attention to the bowel movement. Timely treatment of acute inflammation, to prevent the evolution of chronic, with chronic lesions of the organs, more likely to malignant. The disease can subside by itself, but it takes several years. Treatment can shorten the course of the disease. There is scarring after healing. It is suggested that patients should take prevention as the mainstay and combine prevention and treatment, with a view to achieving the best therapeutic effect and recovering as soon as possible.