peripheral neuropathy
"I have been suffering from sciatica for about 10 years now. It has gradually gotten worse. Ibuprofen, acetaminophen, and naproxin no longer help to relieve the pain in my left thigh. I have found that a generic capsaicin patch placed on my lower back relives the pain. It doesn't fully disappear but it becomes a lot more bearable  (0.025%)"