I tightened my hair extension client about 2 weeks ago. She contacted me today saying her scalp is itching uncontrollably since we did her extensions. I had her come in and it is red and slightly flaky around the rows. I did a grey retouch on her without the extensions in and then I washed and dried and re-applied the extensions and then glossed everything. This is her second move up with this method. No problems the first go round. I had her go get some Benadryl spray but not sure what to do if that doesn’t help or what could be causing it?? Any help would be greatly appreciated.