2 Days Ago, After Exercising A Rash Appeared On My

2 days ago, after exercising a rash appeared on my leg. I took benadryl and the rash disappeared, The next day the same leg was swollen. I took more benadryl and the swelling went down. However, the swelling keeps coming back. I thought that I was having an allergic reaction to citrus, because I have been drinking a lot of water with lemon and smoothies with strawberries and other fruit. Should I continue to take the benadryl?