I've had a case of "skin pain" on my left wrist for about 2 years. My symptoms are the same as what many others have described here - sunburn like pain with no visible signs. In my case the pain would vary from very sore and painful to the touch to hardy noticeable at times but always present. I tried many ointments and creams but nothing worked. My doctor said on 2 occasions that there was nothing he could do about it and probably thought it was in my head.
A month ago I got a prescription from my doctor for an unrelated skin problem and then decided to try it on my wrist as well. After about 2 weeks, the skin pain has pretty much entirely vanished. The ointment was a 1% hydrocortizone PWD (which I assume means powder), with Nystatin cream.
I'm not sure if the Nystatin cream has anything to do with it unless this is a fungal infection of some type. It may well be the Hydrocortizone that is doing the trick for me.
Certainly worth a try. Hopefully it will work for you.