Thanks for writing in.
As of now, I feel you might want to give a trial with over the counter oral anti histamines
and apply some hydrocortisone cream
at the site of the bite where it itches. Horse fly bites do take a while to heal.
In the presence of other symptoms like fever, wheezing
, gradually progressive swelling of the leg, pus formation, with pain increasing in intensity, I would say visit your doctor immediately. If this is the case you might require antibiotics.
Hope this helps.
Dr. Divya Kuttikrishnan