6 months after a hair transplant surgery, my scalp itches

I hit the 6th month mark after a hair transplant surgery and my scalp from time to time itches. However the results so far are really good and I am satisfied with the progress. Do you think that my hair is affected by something? I also contacted the clinic and they told me to drink more water as might the scalp be dry? Please let me know your opinion on this. Many thanks,