A growth on the side of the fart groove could be a folliculitis boil, sebaceous cyst, mosquito bite, and many other conditions, and the patient may be treated with medication or surgery, depending on the situation. 1. Folliculitis boils: Most of the bags on the fart cracks are folliculitis boils, which are related to decreased skin resistance, blocked pores, and secondary infections. Folliculitis boils are red lumps, sometimes with pus, and painful to touch. They can be disinfected with povidone-iodine, treated with oral antibiotics for anti-inflammation, such as cefaclor, amoxicillin and other medications, or by applying erythromycin ointment. 2. Sebaceous cysts: Sebaceous cysts are mainly treated by surgery, and can be treated with laser if necessary. Sebaceous cysts are not red, swollen or itchy in the early stages, and can be surgically removed, and generally do not pose a threat to the body, but when infection occurs, there will be redness, swelling and pain, and other symptoms need to be prescribed antibiotics such as cefuroxime and ornidazole. 3. Mosquito bites: very often mosquito bites will also appear large bags, usually accompanied by itching or pain to the touch, may also be mosquito bites after the skin allergic reaction caused by. Usually there is no need for special treatment, you can also use iodophor or alcohol to disinfect the affected area. Bags on the fart groove may be caused by other reasons, and can not be diagnosed solely on the basis of this symptom, it is recommended that patients go to the dermatology department or surgery of a regular hospital to identify the cause of the disease and then treat the symptoms, avoid self-medication.