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Pimples develop when excess sebum, dead skin cells and bacteria clog the pores of the skin.
Skin tends to thicken and produce more sebum during puberty, making pimples especially common in adolescence.

en.wikipedia.org/wiki/Pimple

This causes a blockage in the pore, especially when the skin ... Some more severe pimples can lead to significant swelling and may ...

www.medicalnewstoday.com/articles/71702.php

Jul 27, 2017 ... Acne vulgaris, the main cause of pimples, affects over 80 percent of teenagers. After the age of 25 years, it affects 3 percent of men and 12 ...

www.medicalnewstoday.com/articles/191530.php

Jun 28, 2017 ... Bursting a pimple may push the infection further into the skin, causing more serious blockage and more severe swelling and redness.

www.proactiv.com.au/how-acne-happens.aspx

To control acne blemishes effectively, it's important to understand how spots form and what causes it. There are 5 main causes of pimples and acne breakouts, ...

www.annmariegianni.com/face-mapping

Also be sure you're not resting your chin in your hands when bored or tired, as this can transfer oils from your fingers onto your chin, which can cause pimples.

www.cosmopolitan.com/style-beauty/beauty/advice/a32686/surprising-things-that-cause-acne

Jul 6, 2017 ... Your period isn't the only thing causing you to break out. Here ... them and resulting in chest acne, bacne, or pesky pimples along your hairline.

www.ask.com/youtube?q=What+Causes+Pimples%3F&v=Db_NvyBuo_E
Mar 20, 2016 ... Pimples (zits, spots) causes, symptoms and treatments medical . , . . . . A pimple is a small pustule or papule. Pimples are small skin lesions or ...

www.marieclaire.com/beauty/news/a13150/why-pimples-keep-coming-back

Jan 28, 2015 ... While we know what causes pimples in the first place—stress, hormones, diet, touching our skin, etc.—the case about why certain zits just won't ...

www.webmd.com/skin-problems-and-treatments/acne/teenage-acne

Aug 26, 2016 ... Pimples usually pop up on the face, neck, back, chest, and shoulders. Acne isn't a serious health risk, though severe acne can cause ...