If the head grows bags, if it is accompanied by swelling, pain, pus head appears, and there is also pus outflow after breaking, consider folliculitis as the most likely. If it is folliculitis you can apply antibiotic ointment topically, such as Bactroban ointment, ichthyolite ointment, etc. You can also take antibiotics orally or intravenously, commonly used antibiotics are cephalosporins, quinolones. If the head grows bags, accompanied by obvious scalp itching, and most of the bags are transient and can be self-relieved, some recurring, should consider the possibility of skin allergies, hives, etc.. At this time, anti-allergy treatment can be given, oral antihistamines. If small insects can be found in addition to large bags, head lice should be considered the most likely, and the head should be shaved as much as possible and topical insecticide ointment should be used to kill the insects.