Why do they ask you to not wear perfumes,lotions,deodorants to a mammogram?

Many deodorants contain a material in them which can leave tiny deposits on the skin. These deposits can look like microcalcifications. One of the early signs of breast cancer are certain types of microcalcifications. You would hate to have a radiologist read your mammogram films, see suspicious microcalcifications, call you back for additional images, only to find out your deodorant was to blame! You should also avoid perfumes, lotions and powders in the breast and underarm area for the same reason.