Materia Medica by Dr. Adolf zur Lippe
Adolf zur Lippe (1812 – 1888) was a German homeopathic physician & a professor in the Homeopathic College of Pennsylvania.

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List of all Homeopathic Materia Medica: Dr. Clarke, Boericke, Farrington, Allen, Dunham, N M Choudhury, Nash,  Boger,  Lippe,  Mure,  Tyler,  Constantine Hering, Kent,  Homeopathic Materia Medica, Online Materia Medica

Castor Equorum.

Excessively sore nipples, bleeding, suppurating, and only hanging on strings.