poultice; cataplasm; medicated compress
A soft, moist mass of material, typically medicated, applied to the body to relieve inflammation or soreness. Often used in medical or home remedy contexts.
The doctor prescribed a poultice for the shoulder pain.
My grandmother applied a medicated compress to my bruise.
Compound of 湿布 (compress) and 薬 (medicine). The term is straightforward and modern, with no obscure historical derivation.