Thanks for your query.
Yes. The problems are due to horsefly venom. The swelling will subside within 2-3 days with anti-inflammatory drugs such as, ibuprofen; anti-histaminic drugs, such as cetirizine
, and a couple of shots of steroid
If the skin is infected, you may have to take a course of suitable antibiotics.
Consult your doctor who knows what will be best for you.
Dr. Rakesh Karanwal