Dab some apple cider vinegar on the sore three or four times a day and let it air-dry. Clean it with ivory bar soap before applying the ACV. Ivory soap will sting, but it is the best cleanser for sores.

Alternately, clean it with ivory bar soap, rinse gently then apply just enough raw honey (not the stuff you buy at the grocery store) to cover the sore and let it sit there for 3-10 minutes undisturbed before bandaging it with the honey in place. See a doctor. debride it twice a day with rubbing alcohol and rough gauze...then triple antibiotic ointment...neo is only one antibio.... Go to the doctor. You made need to antibiotic pills or you could be suffering from another condition in addition to the sore. Go to the Doctor or if still in school school nurse. If no money go to a clinic that is on an ability to pay basis or to an ER because they will treat and bill or allow you to apply for indigent care programs for people with no money. If it is going to heal with home care neosporin would noprmally do it. Since it hasn't you need something storonger an sthat means a prescription from a dr who can tell what kind of sore or infection this is. BTW both Target and WalMart now offer many generic meds including antibiotics at $4 for a month's supply so please do not say you can not afford medicine. Your drs office or clnic or ER can tell you places in your area that help pay for meds. Salvation Army is one but there are others in almost every place.