noun
massaging plaster; medicated plaster for massage
A plaster or patch applied to the skin, often containing medicinal ingredients, used to relieve muscle stiffness or pain through massage-like effect.
肩こりに按摩膏を貼ると楽になる。
Applying a massaging plaster to stiff shoulders brings relief.
膏薬 is a traditional ointment or plaster, often herbal; 按摩膏 is a more modern term for a massaging plaster.
Compound of 按摩 (massage) and 膏 (ointment, plaster). The exact historical derivation is uncertain, but the term likely emerged in modern medical contexts.