In people with certain skin conditions like psoriasis and eczema, their bodies make too much of two harmful chemicals that combine to create a damaging substance, which throws off their natural balance and weakens their body’s ability to protect itself.

In people with certain skin diseases like psoriasis, the body makes too much of two harmful molecules (iNOS and NADPH oxidase) that combine to create a damaging compound (peroxynitrite), which breaks down the skin’s natural defenses. This study shows that’s exactly what happens in these patients.