Ether: sprayed on for a little time will cause an eschar to separate.
Europhen.
Hydrogen Peroxide.
Ichthalbin: internally.
Ichthyol: topically.
Iodine: locally, to lessen pain and inflammation, should be applied around the base.
Iodoform: useful local antiseptic dressing.
Iodoformogen.
Iodole.
Lead Carbonate.