The boil is a bacterial or fungal infection induced inflammatory skin disease in the hair follicle area, so you should see a dermatologist to check for fungal microscopy. 1. If positive, you can apply topical terbinafine hydrochloride or ketoconazole, itraconazole, or bifenoconazole to avoid scratching and squeezing to aggravate the infection. 2. If the microscopy is negative, consider the bacterial infection and induced, you can apply topical fusidic acid, erythromycin, clindamycin twice a day for anti-infection treatment, in addition, you need to avoid spicy, fried and sweet food.