Shea Butter?

I was talking to a friend a week or so ago and mentioned my fear of using shea butter.  Any time I use a product with shea butter in it I get itchy.  I've tried a couple of different body washes containing shea butter thinking they would be great for my dry skin but I just end up miserable.  My friend said she has the same problem.  I now stay away from things containing shea butter but I thought I would mention it.  I'm wondering how common this is.