osteoarthritis
"Probably best to do a small patch test before you use this product.  Also, different Capsaicin preparations are more potent than others. 

I have bursitus in my shoulder and it is very painful particularly when I sleep wrong on my shoulder. 

Capsaicin is the only relief I get.   Now able to sleep through the night, yes, it burns, that's the point, it exhausts the pain receptors in the area.   Best product but you have to expect to burn, that's what it does, that's how it works."