To diagnose skin conditions, healthcare providers typically consider a person’s medical history and physical symptoms.

Your skin—the body’s biggest organ—shields you from the elements. However, you can sometimes still develop skin conditions, or various problems with your skin. Some common skin conditions include eczema, psoriasis, hives, and vitiligo.

Skin issues can generally be unsightly but harmless, contagious, itchy, painful, or a combination of those features. Here’s what else you need to know about 15 common conditions, including treatment options and when to see a healthcare provider.

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