If a bag grows on the head and hurts when pressed, first we have to analyze the cause of the bag and then give the appropriate treatment, generally there are two cases, one is caused by infection and the other is caused by trauma. If it is an infection, it may be a purulent inflammation or abscess, purulent inflammation or abscess is usually accompanied by pressure pain, and increased local skin temperature, which requires antibiotics to treat, you can take oral cephalosporin antibiotics, in the local use of topical antibiotic cream, such as neomycin ointment can be used. If the pus is only mild, you can apply topical antibiotic creams, such as some Longzhu ointment. If the swelling is more pronounced and there is a fluctuating sensation when pressed, it means the pus is larger and may need to be incised to drain the pus. There is also a form of infection called folliculitis, which is also a bacterial infection, you can use some topical Bactrim cream, you can also take oral cephalosporin antibiotics, and also drink more water and avoid the stimulation of spicy food. If the hematoma is caused by trauma, the first thing to do is to go to the hospital for an examination to rule out any other injuries, such as cranial injuries, etc. If the hematoma is only a hematoma, it is important to go to the hospital in the early stages of the disease. If the hematoma is only a hematoma, it can be treated with cold compresses or oral medication to activate blood circulation and resolve blood stasis in the early stages.