This is commonly due to the following causes: First, sebaceous cysts, which can occur when local hair follicles are blocked. There will be mild localized pain and sometimes redness and breakage of the skin. This requires a visit to the hospital for ultrasound and other tests. If the disease is present, it needs to be surgically removed under local anesthesia to prevent late rupture and infection. Second, folliculitis, often caused by local non-cleaning, can be applied iodophor, or topical drugs such as Bactrim. At the same time, you should also pay attention to your diet, such as not eating too spicy food, such as chili, spicy strips and spicy hot pot. Thirdly, lymphadenitis is often caused by bacterial or viral infections. The symptoms can be relieved by drinking warm water and taking some oral medications to clear the heat, such as Shuanghuanglian Oral Liquid, or Jinyinhua Oral Liquid. There are other causes, such as local bacteria.