Apply to painful or swollen muscles, legs, joints or insect bites. First Companion Epsom Salt Poultice can be covered with cotton and/or wrapped. Will not burn or blister skin. Let draw and soothe for 36 to 48 hours. Repeat as needed for relief of soreness and swelling. For hooves, pack the entire sole and frog to draw abscesses or address sole bruising. Cover with a wrap or boot and let draw for 36 to 48 hours.