Is It Normal to Have Itchy Scalp 2 Years After Endoscopic Forehead Surgery?

Given that your itching persists 2 years after surgery, it may be time to consider intervention. I have found neurontin (gabapentin) to be useful for this type of nerve irritation.

The itchiness is likely due to subtle dysfunction of the nerves that supply the forehead secondary to stretching during the procedure.  Even though it is two years there is still a good possibility this will go away with time.  I do not think that benadryl will be of much help but the injections into the nerves will give at least temporary relief.  Also, stabilizers of nerve impulses like anti seizure medications and / or elavil (intially an anti depressant but found helpful in some neuropathies) can be useful.  These medications will need to come from a physician and sometimes require blood tests to monitor.  Just some ideas to think about.