The fellow who submitted this amazing and disturbing pair of photos was mowing his lawn and has no memory of encountering poison ivy.

But this kind of rash indicates that a lot of urushiol plant oil was deposited right between those two fingers, and no place else.

Short of calling in the police forensic team, we can only guess how he got this nasty thing.

Theory 1: The mower cut into some ground poison ivy vines and let loose lots of plant sap; he then touched the mower where the oil had landed, maybe when putting it away.

Theory 2: At some point he ran a poison ivy vine between these two fingers without realizing it.

Theory 3: Who the heck knows? What is your guess?