I work outside, today as I was cleaning some daylilies I got some sort of irritant on my arm - not sure if it is from a chemical, an insect, or an irritating plant. It is not poison ivy. There are no blisters, its just like a streaky red mark that feels almost like a burn -- it just stings, no itching. I ve tried washing it with soap, water, technu, I even went swimming in the ocean. Still feels very burn-y. It hasn t swollen or spread since this afternoon. Any ideas?