You can be forgiven if you aren’t sure how jurisdictional waters are currently defined in the United States. Since 2015, the definition of Waters of the United States, or WOTUS, has changed more often ...

With its loose, bunchy skin and sun-starved complexion, the naked mole-rat (Heterocephalus glaber) recalls an uncooked bratwurst dried on permanent press—and it might be one of the last creatures ...

When a new mole appears, or a previously stable mole begins changing, this could be an early warning sign of cancer. But what about when a mole disappears? Moles sometimes fade or disappear, ...

A mole is an unwanted skin growth. It usually looks like a flat or raised bump that’s the color of your skin or darker. Most people get moles as a teenager or adult. Some moles are present at birth.

A mole is a colored spot on your skin caused by a high concentration of pigment-producing cells called melanocytes. The medical term for a pigmented mole is a melanocytic nevus, or simply nevus.

Moles form on your skin when clusters of melanocytes, or pigmented skin cells, grow in small, concentrated areas. They usually appear as colored bumps or spots that vary in shape and size and are ...