Hi:

I have had a VA shunt for nearly 50 years now and went programmable in 2003. Since then I have been experiencing the same type of soreness from time to time. It can be a real bother at times. It has generally gone away in time. If it ever persists and causes any sever pain or symptoms similar to what shunt failur e feels like you need to see a Neurosurgeon and make sure that the shunt is functioning properly.
I have heard it mentioned that sometimes a warm cloth on the sore area can be of some help and in other cases a mild over the counter pain reliever like Tylenol can be of help
Hope this helps some of you.

Be well all

Mister (Junius in another life)