I have a severe MP (meralgia paresthetica-- a neuropathy of the lateral femoral nerve) along with my foot and hand issues.

For years after my C-section I had severe pain in my thigh, from this. So when Lidoderms first came out, I used them and
noticed a rapid improvement, but not a cure.

Some things still set it off. Bicycling will do it.
And when I joined a fitness club... well. that sauna which was heavenly in most ways, just set it off big time. Majorly!
Within 10 minutes, I was in agony, and this is when I had no pain previously!

So I don't do hot anymore. No more hot baths either (which I was sort of addicted to).

I might get 3 or 4 shots of pain a year now, instead of many a day, since I stayed away from heat.

I never had more foot pain however. So if you have some specific nerve issue, then I would be concerned.

I think you can try it, and within a very short time you will definitely KNOW if heat is bad for you. I cannot stand heat in summer if it is over 80-85 degrees with no air conditioning for my feet. But PN people differ. If you get reactions, then you will know heat is NOT for you.