Moles: Learn about moles

Learn about moles , skin growths that can be tan, brown, black, or skin-colored. Find out how to distinguish between regular, irregular, and cancerous moles , and how to prevent and treat them. What is a Mole? In the field of chemistry, a mole is defined as the amount of a substance that contains exactly 6.02214076 " 1023 ‘elementary entities’ of the given substance. The number 6.02214076"10 23 is popularly known as the Avogadro constant and is often denoted by the symbol ‘N A ’. The elementary entities that can be represented in moles can be atoms, molecules, monoatomic/polyatomic ions, and other particles (such as electrons). For example, one mole of a pure carbon-12 (12 ... Moles are common skin growths caused by clusters of pigment-forming cells. Learn how to recognize moles , when to see a doctor and how to reduce your risk of melanoma. Moles can appear on your scalp, armpits, under your nails, and between your fingers and toes. By the age of 50, many of these moles would have developed. Over time, moles may change appearance or fade completely. Adolescent and pregnancy hormone changes can cause moles to darken and grow in size.