The sudden growth of a large pimple on the face may be due to folliculitis, sebaceous cysts, insect bite dermatitis and other factors, and common treatments are erythromycin ointment, mupirocin ointment and other medications, laser treatment, surgical treatment. 1. Folliculitis: mainly caused by bacterial infection, can use erythromycin ointment, mupirocin ointment and other local application under the guidance of the doctor; if necessary, take ultraviolet light treatment, ultra-short-wave treatment and other physical therapy to promote the inflammation to subside; if the formation of boils, it is necessary to consider surgical incision, drainage treatment. 2. Sebaceous cysts: also known as “powdery tumor”, mainly due to the sebaceous gland duct obstruction, the gland content accumulation caused by the manifestation of a round swelling, normal skin color or light blue, most of the single hair. Its treatment is based on surgical treatment, for no infection, and cysts smaller can also be considered for laser treatment. 3. Insect bite dermatitis: it is a kind of dermatitis caused by the bite of mosquitoes, mites, cryptic insects and other disease-causing insects, which can be manifested as edematous pemphigoid-like papules, wind clouds, blisters, itching and other symptoms. Anti-inflammatory and antipruritic treatment can be carried out under the guidance of a doctor using drugs such as Dinaid cream, hydrocortisone butyrate cream, flufenamic acid butyl ester ointment, and glycerite lotion. The sudden growth of a large pimple on the face may also be caused by other causes, it is recommended that patients seek medical attention in a timely manner, and actively cooperate with the relevant examination, in order to clarify the cause of the disease, symptomatic treatment, to avoid the use of private medication, so as to avoid delays in the condition.