Biking Days Over??

My mountain biking days may be over.  : (  For the first time in my life I have poison oak on my legs and it's spreading.  It's definitely not a really bad case of it but it's enough.   I'm itching so bad I want to claw myself to death.  I've definitely bruised my legs from scratching so hard.  I don't know if there's something you can put on your legs to prevent getting it but if there's not I think I'll give up biking.  As much as I love it and get a rush from it, it's so not worth this.  Perhaps I'm a wimp but I can live with that....just can't live with poison oak!