Silkworm Droppings … Classic Formulas
Can Sha · Excrementum Bombycis Mori
Primary Actions
- Dispels wind-dampness and unblocks the channels for joint pain, heaviness, numbness, and rheumatic painful obstruction.
- Harmonizes the Stomach and transforms turbid dampness, especially for abdominal pain, vomiting, diarrhea, and cramping when dampness obstructs the middle burner.
- Activates Blood and frees the collaterals in older use for limb pain, menstrual irregularity, and obstructive discomfort.
- Relieves itching and can be used externally for damp or wind-related skin irritation.
Classic Formulas
- Can Shi Tang and related damp-turbidity digestive formulas ... the classic middle-burner use for vomiting, diarrhea, and leg cramping.
- Wind-damp Bi combinations with Sang Zhi, Fang Ji, or Yi Yi Ren ... the usual joint-and-channel context.
- External washes or warm compresses ... traditional practice for itching, swelling, and damp skin complaints.
Classical Text References
- Traditional herbology describes Can Sha as pungent, sweet, and warm, entering the Liver, Spleen, and Stomach.
- Classical texts consistently emphasize two main lanes ... wind-damp joint pain and damp-turbidity digestive upset.
- Older commentary also notes that Can Sha is mild and non-toxic, which helps explain its long use in external as well as internal applications.