Wintergreen
Gaultheria procumbens...
“Methyl salicylate topical (for the skin) is used for temporary relief of muscle or joint pain caused by strains, sprains, arthritis, bruising, or backaches. Methyl salicylate topical can cause a cold or burning sensation, which is usually mild and should lessen over time. If the burning sensation causes significant discomfort, wash the treated skin area with soap and water. Do not apply to open wounds or irritated skin, and avoid getting the medicine on contact lenses, dentures, and other items that come into contact with sensitive areas of your body.”
- http://www.everydayhealth.com/drugs/wintergreen-oil-gaultheria-procumbens
a.k.a.
boxberry, checkerberry, eastern teaberry, mountain tea, partridge berry, teaberry