well it appears maybe a couple of things growing together,? hard to tell.
My guess is poison oak.
if the rash is really bad and you just can't stand it, go to the dr. They gave me some pills, some type of steroid? and it got rid of really really quickly.
Whatever this is, do not burn it, it can cause rash by inhaling the smoke. Also if you get it on your clothes, wash them separately w hot water and extra soap and rinse. It can stay active on clothes, pets, furniture, tools ect.