The excitement of trying a new skincare product can quickly turn into disappointment when redness, itching, or irritation appears hours later. Whether it’s a promising eye cream, revolutionary serum, ...

Using a new skin care product without testing it first can potentially cause allergic contact dermatitis, an inflammatory skin condition in which the immune system overreacts to an ingredient in the ...

If you regularly read skin care stories, you’ve probably come across the often-touted advice to patch test new products before trying them. (It’s certainly a suggestion SELF has made more than once!) ...