Ten days ago I stepped on a jellyfish tentacle (long story) while on vacation. Toe and foot had severe pain/itching. Next day a rash on my arms which spread over the next five days(we were on vacation and I felt fine otherwise so I did not seek treatment). I finally took Benadryl and called my doctor on a Friday. They schedule an office visit the following Monday. The rash is 90% gone but he prescribed Prednisone anyway. I read the side effects and am not comfortable with them especially since the rash is going away. I have not taken any of the Prednisone yet.