A hard pack on the buttocks may be formed by secondary infection of folliculitis. You should eat a light diet and avoid eating spicy and stimulating foods to avoid aggravating the condition. In addition, pay attention to local hygiene, wash the buttock with warm water, disinfect it with iodophor on the surface, apply antibiotic ointment, and take oral antibiotics, which usually require second-generation cephalosporins, such as cefixime. Pay attention to observe again whether the buttock mass shrinks or becomes larger during the treatment process, and if it shrinks, continue the treatment; if the mass becomes larger, the center of the mass becomes softer, and there are abscesses and necrotic material forming in the center of the mass, it is necessary to cut the mass open, drain the pus, and change the medicine in surgery at this time.