Your itch could be caused by a nerve inflammation in your neck or back. If icing your neck and more likely your upper neck resolves the itch, it is related to inflammation in your neck. The upper neck is often injured during a concussion.

If not, try some Benadryl. If it resolves the itch, it is an allergy type of itch.

Tell us about your symptoms and what you are doing to try to help your brain recover.

There are lots of helpful people here.

It will be easier if you try to keep you questions in one thread rather than creating multiple threads.

My best to you.