Bark of Oriental Variegated Coralbean Classic Formulas

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Dispels wind-damp and unblocks the channels - a classic bark for painful obstruction affecting the low back, knees, joints, and sinews when chronic dampness and wind lodge in the collaterals.
Relieves pain and reduces swelling - used when bi syndrome is complicated by edema, heaviness, or painful weakness of the lower extremities rather than sharp acute heat alone.
Kills parasites and relieves itching externally - traditional washes and powders apply Hai Tong Pi to scabies, fungal lesions, and damp-itching skin disorders.
Supports lower-body strength in chronic wind-damp patterns - especially when lumbar aching, weak knees, and difficulty walking suggest long-standing obstruction in the Liver-Kidney channel network.

Hai Tong Pi Jiu (海桐皮酒) - traditional medicated wine preparations centered on Hai Tong Pi for chronic wind-damp painful obstruction, lower-back soreness, and weakness of the legs and knees.
Hai Tong Pi San (海桐皮散) - later wind-damp pain formulas using the bark as a chief or deputy herb for aching joints, numbness, and channel obstruction.
Classical external wash and powder preparations use Hai Tong Pi for scabies, damp itching, and fungal-type skin lesions when internal wind-damp and surface parasite conditions overlap.

Sacred Lotus records Hai Tong Pi as bitter, acrid, and neutral, entering the Spleen, Liver, and Kidney to dispel wind-damp, kill parasites, and stop itching.
Later materia medica traditions emphasize its special usefulness for lower-body wind-damp pain with weakness, especially when chronic dampness has settled into the back, knees, and joints.
Because it is neither strongly hot nor strongly cold, Hai Tong Pi is often chosen for chronic bi syndrome where movement and unblocking are needed without harsh temperature bias.