Hi. I Did Yard Work About Two Weeks Ago. Trimmed

Hi. I did yard work about two weeks ago. Trimmed azaleas, pulled weeds. About 2 days later I had a few itchy bumps on the back of my lower arm. They were raised, only slightly red, and like hard little nodules. I assumed insect bites. They are still there, red, raised and itchy. They are not blistery or weeping and a bit more red so I am thinking it is some sort of allergic reaction. Have been using cortizone cream and calamine lotion. Any ideas?