I dont know why, because you cant even use any form of products on your body 24 hours before surgery, deodorant, perfumed soaps etc! Nothing is used before after you are given he all clear to shower you are ok to have water run over your incisions bit you cant be submerged in any sort of water, you also cant get shampoo or any other products on your scars. Only after your six week check and being given the all clear, you can submerge in water and have products on your scars!! xxx