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How can I tell if I am allergic to ant bites?

I am a 19 year old student without many allergies. I am allergic to penicillin and have occasional seasonal allergies but was recently bitten by several ants - bites that ended up in a trip to the emergency room. My foot became swollen and was hot and itchy for several days. However, I was bitten again on a separate occasion and immediately took Benadryll and did not suffer any pain or swelling. Am I allergic?
This is an interesting question, but it is important to clarify that your particular problem does not appear to be an allergy at all. Allergies are reactions to substances that your body causes that are out of proportion to the danger, such as the very runny nose that comes with pollen, or the hives and airway compromise that comes to some people with a penicillin allergy. They are generally marked by a release of histamine from mast cells, which is what causes the runny nose and hives. The reactions often increase in intensity with each new exposure. Your description of your foot becoming hot, swollen, and itchy sounds more like an infection that required a trip to the emergency room for antibiotics. Whenever the skin is damaged, there is the potential for bacteria to enter and cause an infection, which it sounds like you had. The response to an infection is increasing blood flow, which causes heat and swelling. Itching can also accompany bacterial infections. The fact that you took benadryl the 2nd time and had no reaction is probably just a coincidence, as you have likely been bitten by ants many times in the past without reaction. Please discuss with you primary care doctor or allergist as needed.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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