Dandruff and itchy scalp 5 months after HT

[vinnytr]

Ok I am aware dandruff and itchy scalp are things that go hand in hand and they cause inflammation of the scalp which is not ideal .

I was a NW6 before a 4000 odd graft FUE surgery I had 5.5 months ago . The growth is quite good so far and I have a natural looking HT .
I keep sharing my photos every often.

http://www.baldtruthtalk.com/showthread.php?t=10157

But for the last couple of weeks I have noticed a severe itch at times and when I use hair brush or my fingers to scratch it I get loads of dandruff which I have not had prior to HT .
All I have been using since HT are 10000mg BIOTIN a day and ROGAINE minoxidil liquid once or twice a day sometimes .
I also use nizoral 2% once a week .

Any ideas would be much appreciated as to whats causing this itch and dandruff