I got hair extensions a few weeks ago, and while the girl was putting them in, she said to me that my scalp is so dry. I didn't think anything of it, but since having my extensions in, it's been horrendous. So dry, flaky and mega itchy. Any suggestions of anything I can use on it? I'm having to use sulphate free shampoo and conditioner so that I don't damage the extensions, so not sure if there's anything I can put on it. It's driving me mad 