It happens to a lot of woodwokers, especially with oily and exotic woods. They work with woods for years with no problems but through prolonged exposure become sensitized. Some have to stop working with the wood altogether, but many of them can handle things by limiting or eliminating as much exposure as possible. wear clothing to eliminate contact, set up dust collection to take dust out of the air or wear a respirator, and wash exposed areas as soon as possible after contact. This usually makes it manageable.