Alum in block form (usually potassium alum) is used as a blood coagulant. It is widely used after shaving, rubbed over the wet freshly shaved face. Alum may be used in depilatory waxes used for the removal of body hair, or applied to freshly waxed skin as a soothing agent. Alum's antibacterial properties contribute to its traditional use as an underarm deodorant. Alum in powder or crystal form, is sometimes applied to cuts to prevent or treat infection. Powdered alum is commonly cited as a home remedy for canker sores. Alum is used because of their astringent properties can be used to dry pimples when applied on them.