Sebum is a natural, waxy oil produced by glands ... dead skin cells, and residue from haircare products like hairsprays or hair gels. Excess sebum looks oily or greasy on the skin.

If your hair feels like it has a waxy coating or looks like you’ve ... re dealing with dandruff when it’s just bad product residue. What to do: Look for alcohol-free products.

As the name suggests, build-up develops when hair products accumulate on the scalp, often leaving it flaky or with a noticeably waxy feel ... away oil and product residue while being ...