Skin Rash Hall of Fame

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The String Trimmer Poison Ivy Rash

I am not sure this rash came from using a string trimmer around poison ivy, but this is what comes to mind.

The weed whacker cuts into the poison ivy and sends a stream of the plant oil, urushiol, onto your legs. Notice that there are no cuts, just lots of deep red rash.

But I wonder: why is the rash worse behind the knees?