Bell's Magnesium Sulphate Paste BPBell's Magnesium Sulphate Paste is used in the management of superficial skin infections, including boils. When applied to the skin, the ingredients help to draw infected wounds & reduce inflammation. Directions For use on the skin only. Stir paste well before use. Apply liberally to the affected area & cover with a clean dressing. If symptoms do not go away or you need to use it regularly talk to your doctor. Ingredients Dried Magnesium Sulphate 47.76% w/w, Phenol 0.49%w/w. Also contains: Glycerol (E422).