I had a chunk of bull-nettle[1] land on my forearm in college. That spot occasionally flared up and again became painful for several decades afterwards... [1]

I had a chunk of bull-nettle[1] land on my forearm in college. That spot occasionally flared up and again became painful for several decades afterwards... [1] https://en.wikipedia.org/wiki/Cnidoscolus_texanus https://en.wikipedia.org/wiki/Cnidoscolus_texanus