SAFE EFFECTIVE RELIEF. The CareWear Light Therapy Patch is an Over-the-Counter (OTC) medical device designed to deliver light therapy that raises tissue temperature. It is indicated for the temporary relief of minor pain, sprains, strains, muscle stiffness, and minor joint pain related to arthritis. Additionally, it aids in muscle relaxation, alleviates muscle spasms, reduces minor muscular back pain, and temporarily enhances local circulation at the application site.