I was working outside and I am very allergic to poison ivy. I had it 2 weeks ago and it went away. I woke up this morning and had a couple itchy rashes on my shoulders. I went to the bathroom and my penis itches all over and it was very swollen around the head and inflammed. I called my doc and just took my first dose of prednisone. Should I also get a shot to reduce the swelling? It has increased swelling throughout the day to about 2-3 tines it’s size. What would you suggest?