This is a small round-shaped heat-type medical patch (plaster), the active ingredient (4-Hydroxy-3-methoxybenzyl Nonylic Acid Amide) of which produces tingling heat stimulation that improves the blood flow in the affected area, relieving shoulder stiffness and lower back pain.

Indications:
Stiff shoulders, lower back pain, bruises, sprains, joint pain, muscle pain, muscular fatigue, chilblains, bone fracture pain

Can be found in mostly pharmacy around Japan such as Matsumoto Kiyoshi, Don Quijote, Sun Drug, Kokumin, Bic Camera, etc

Pricing: ¥900 ~ ¥1,200

PS. As a tourist, you are also eligible to tax free when shopping in Japan. Enjoy your shopping without tax!!