Sebaceous cysts are benign proliferations resulting from excessive secretion by one's own sebaceous glands. These cysts accumulate under the skin and contain a bag filled with tofu-dregs-like substances. They may gradually grow and cause pain, though they do not lead to severe infections, so sebaceous cysts are not a symptom of serious infection. After identifying this condition, it is necessary to visit the dermatology department of a formal hospital, where a minor surgery can completely remove the cyst and the tofu-dregs-like substance to effectively cure the disease. After treatment, it is crucial to maintain a regulated diet and lifestyle, avoid spicy and stimulating food, refrain from staying up late, reduce sebaceous gland secretion, increase exercise, bathe frequently, and sweat more, all of which help prevent recurrence.