Welcome to NeuroTalk!

I have some questions and comments.

1) Where are you applying the Aspercreme/Lidocaine?
To test yourself about carpal tunnel compression, doing a Tinel sign test on your inner wrist will elicit tingling and electrical zaps. Take a wooden spoon and tap your inner wrist...heavy hitting is not necessary. If there is compression there you will feel it. This location is one spot the Lidocaine lotion works well. I use it there myself! There are Tinel Sign videos on YouTube.

2) often when there is surgery, the nerves are severed so there can be little pain at first. Then the nerves start to grow back, and then strange or painful sensations return. Also some people have a genetic tendency to form fibrosis at injury sites. I have experience with this, when I had tumor removed on my left instep many years ago... it was pretty numb for many years, but those nerves grew back and I do have pain where that long scar remains, occasionally.

3) there are nerves in the tendons so if you overuse or extend that hand, you can irritate those nerves.

I see you use a statin. Do you know that new research shows that statins prevent nerve growth factors that help remyelinate the axons which then do not work properly.

Statins in general do cause some forms of neuropathy. You can Google their effects yourself and discuss this with your doctor. If you are only borderline like many others, doctors push statins for those patients who are not having dangerous levels.

Try some cold pack compresses on your inner wrist before bedtime. This may help too. Use of a carpal tunnel splint at night might help too. Just don't use one that is too tight.
20 minutes is long enough to calm the nerves down, and use a thin cloth between the cold and your wrist.

You can try soaking the hand in warm water with some epsom salts in it... an ounce or so of salts to a gallon of lukewarm water for 1/2 hour at night might help your hand nerves.

There is a medication for fibrosis. It was designed for Peyronie's disease..and it is called Xiaflex and is also sometimes used for Dupuytren’s contracture of the fingers.
It helps remove excess scar tissue that causes compressions.
You might consult a hand specialist if you haven't already done so, if you continue to progress with pain, and that doctor could decide if it would be helpful for your scar.