Advice

I need advice.
I had a client come in yesterday who has really badly chronic dry skin. It was extremely rough to the touch and spreads down to her neck and recently along her chest. She says she’s been battling this for three years and has been seeing a dermatologist but nothing has been helping. She’s gotten hydrofacials as well as a HA diamond glow from one of my girls at the spa I work at but said she only felt great for a couple of days and then like 5 days later back to being really dry. She doesn’t have psoriasis or eczema both have been ruled out by her derm. It’s not flaky, itchy, and I didn’t see any redness whatsoever. She’s been using squaline oil with her moisturizer as recommended by her derm but even that doesn’t help.