Bad technique can absolutely leave a mark,” Limor Weinberg, a board-certified nurse practitioner, told The Post.

The five main skin types are normal, dry, oily, combination (dry and oily), and sensitive. Your skin type is usually predetermined by genetics. Environmental factors like sun damage, hormonal changes, ...

Carley Millhone is a writer and editor based in the Midwest who covers health, women's wellness, and travel. Her work has appeared in publications like SELF, Greatist, and PureWow. Mandelic acid ...