Hello dear, Thank you for your contact to health care magic. I read and understand your concern. I am Dr Arun Tank answering your concern. Horsefly bite is going to be heal soon as indicated by decrease in its size. I advice you to take care for wound in means of hygiene, please do dressing and frequent cleanliness. You can take ceteizine and prednisolone under your doctors guidance. It will help your wound to get clear earlier. Because it contains some antigenic material which will be cleaned by antihistaminic drugs. You can use polysporin ointment over the wound. Betadine ointment can help prevent I infection you can also use it. Please avoid injury to the wound part to get it clear early. I will be happy to answer your further concern on bit.ly/DrArun. Thank you, Dr Arun Tank Infectious diseases specialist, HCM.