We have had discussions about this capsaicin patch on this forum.

You can search for it on the main forum below.

Not many people in recent years have mentioned it, and I think that is because the lidocaine patches, became more popular.

Capsaicin is not really tolerated well by everyone. Some people cannot stand the burning it causes.

Our software does not support a 3rd party sharing links from a search...so I cannot list my search just now on
"capsaisin patch".

But here is an example:
A transdermal patch containing 8% capsaicin...

This post above is from 2010.
Here is another short discussion:
Qutenza for burning pain, Anyone try?

I found one interesting thing at CafePharma forum for sales reps discussions. In 2014 they discuss the "unavailability" of Qutenza patches and doctors asking why they cannot obtain it. No answers were forthcoming.

Just because we don't have many posts about it, just means people are not using it or asking about it. I found just a few hits on Google, so I don't think it is widely used now. Lidoderm patches seem to be much more popular. And now they are even OTC at 4% (the RX ones are 5%).