Final answer:
BenGay, Icy Hot, and SalonPas contain capsaicin, which is a pain-relief compound derived from hot peppers, not to be confused with NSAIDs or acetaminophen.
Step-by-step explanation:
BenGay, Icy Hot, SalonPas all contain the compound capsaicin, which is the active ingredient responsible for the heat in hot peppers. Capsaicin is known for its pain-relief properties and is used in topical analgesics to provide temporary relief of minor aches and pains of muscles and joints. It is not an NSAID (nonsteroidal anti-inflammatory drug) like ibuprofen or naproxen, nor is it acetaminophen (which is antipyretic and analgesic but only weakly anti-inflammatory), and it is different from numbing agents such as benzocaine. These topical pain relievers are commonly used to alleviate discomfort associated with conditions like arthritis, backache, and strains.