Hydrastis.
Ichthalbin: internally.
Ichthyol: externally.
Iodide of Sulphur: in all stages of the disease.
Iodine: is of doubtful value.
Iodole: topically.
Levico Water.
Liquor Hydrarg. Pernitratis: a single drop on an indurated pustule will destroy without a scar.
Magnesium Sulphate.
Mercurials: internally.