Dandruff and dry scalp both cause annoying flaking, but they aren’t the same problem. The main difference between the two is the type of flakes produced.
With dandruff, you’ll see large, greasy flakes fall onto your shoulders, and your scalp could be red and itchy. It can be treated with either an anti-dandruff or prescription-strength shampoo.
Dry scalp, on the other hand, includes powdery flakes when you brush or wash your hair, and your scalp might feel tight. It can be a result of anything from product buildup to an underlying health issue. Many people find relief by using conditioning treatments that focus on the scalp.
It’s important to not use anti-dandruff shampoo on a dry scalp, as it can dry out the scalp further.
*Source NewBeauty.com