Castor equi
Equine chestnut (callosity from horse's leg) · Animal
Castor equi principally affects female organs, especially the nipples, and acts on nails and bones. It is suited to persons with skin thickening conditions, warts, and cracked or ulcerated nipples requiring surgical attention.
Key symptoms
- Cracked and ulcerated nipples, excessively tender
- Violent itching in breasts with reddened areola
- Swelling of mammae
- Warts on forehead and breast
- Pain in right tibia and coccyx
- Chapped hands
- Psoriasis of the tongue
- General thickening of skin and epithelium

Rudimentary Thumb-nail of the Horse
General action on thickening of the skin and epithelium. Psoriasis linguæ. The clinical experience of Hering and his fellow-provers has shown this to be highly useful remedy in cracked and ulcerated nipples. Affects principally female organs. Acts on the nails and bones; pain in right tibia and coccyx. Warts on forehead. Warts on breast. Chapped hands.
Chest
Cracked, sore nipples, excessively tender. Swelling of mammæ. Violent itching in breasts; areola reddened.
Relationship
Compare: Graphites; Hippomanes; Calc. Oxal.
Dose
Sixth and twelfth potency.

The Rudimentary Thumbnail of the Horse. A small, flat, oblongoval horn, wrinkled on surface, breaking off in scales, darker than the hoof, growing on inner side of leg above fetlock. Scales triturated.
Clinical
Coccygodynia. Epilepsy. Nails, affections of. Nipples, cracked; ulcerated. Warts.
Characteristics
This is a very ancient remedy, and was proved and introduced into homœopathy by Hering. It especially acts on the nipples, the nails, and bones, especially causing pains in right tibia and coccyx. Burnett has cured with it a case of wart on forehead.
Relations
Hep. relieves the sore nipples; Thuja has removed warts caused by Cast. eq. Compare: Calc. oxal., Hippoman., Castoreum, Moschus.

Phatak's chapter on Castor equi is available in the app.
Read Phatak in the appClassical texts are in the public domain. Educational reference only — not medical advice.