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They form one of the varieties of the so-called rodent ulcer.

Everything chronic was favorably affected—lupus, rodent ulcer, eczema, acne rosacea, even tuberculosis of the lungs.

Thus in the treatment of rodent ulcer, a pad of lint saturated with a 5 per cent solution of zinc sulphate is placed over the ulcer.

Cases of rodent ulcer unaffected by all other methods of treatment have been cured by electric kataphoresis with zinc ions, and the method is now being applied to the treatment of inoperable malignant tumours.

As a student, he happened on a photograph in an old medical textbook that showed a woman's face half eaten away by a rodent ulcer – inside and outside had become horribly confused.