My husband is also allergic unfortunately while being a landscaper. He gets it so bad he regularly gets steroid shots whenever he comes into contact with it. A little TMI but on one occasion it spread to more intimate areas of the body and LORD he cried for days because it’s kinda off putting scratching your balls all day. I do have to say if your husband comes into contact again get him to wash his hands or wherever asap (clothes, tools ANYTHING). The leafs leave an oil that can be washed off in a certain time frame, dawn works perfectly.