Magnesium sulphate paste is used as a drawing salve to treat small boils and infected wounds and to remove 'draw' small splinters.[2] Black ointment, orIchthyol Salve, also calledDrawing Salve, has been traditionally used to treat minor skin problems such assebaceous cysts, boils,ingrown toenails and splinters.
In the days beforedipping, a greasy salve was rubbed into the wool of sheep in the autumn as a precautionary measure against parasites - as referenced in social literature about ancient farming areas in England.[3]