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6. Belly button

A 2012 study published in PLOS One suggests that the bacteria found in belly buttons are highly diverse, with more than 2,300 species of bacteria burrowed in the navel — 1,458 of which may be new to science. “It’s an area that’s warm and moist so it can grow yeast as well,” Dr. Lisa Kellett, a principal dermatologist at DLK Cosmetic Dermatology and Laser Clinic, told Yahoo Canada. So it’s an area you might want to avoid picking at, but you should wash in the shower (along with these three other body areas).

7 body parts you should never touch

Many people randomly touch their faces throughout the day — a hand on the cheek, a palm against the forehead, resting the chin on the back of the hand — but by doing so may inadvertently transfer bacteria and allergens from the fingers to the skin.

ALSO SEE: 4 body parts you should be cleaning (but probably aren’t)

Dermatologist Dr. Ava Shamban, author of Heal Your Skin, told the Huffington Post that touching your face might not technically cause acne, but it could exacerbate or trigger it. This is because your hands contain oils that can lead to bacteria spreading to other pores, resulting in more pimples. Touching your face often can also make you more susceptible to catching a cold or a flu since your hands can come into contact with millions of germs.

In addition to your face, click through the gallery for other body parts you should avoid touching.

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