Thanks for the query.
These white scales can be dandruff
Another possibility is scaling due to use of minoxidil
Even minoxidil can lead to dry and scaly scalp
continue the treatment,
slowly you will get adapted to it.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.