Wrinkles: Constantly staring down at your cell keyboard is hurting you more than you know. Keeping your gaze downward for long periods of time can cause "techneck" — wrinkles underneath the chin and around the neck. Squinting at the too-small text can also cause crow's-feet around the eyes.
Skin Allergies: The next time you break out in a rash, consider that your phone could be the culprit. A recent study proved that the nickel and chromium in cell phone casings can cause a reaction on skin called allergic contact dermatitis.
Acne: Did you know that your mobile phone carries more bacteria than the toilet seat handle? (Gross!) Just think about all that makeup and sweat that ends up on your screen after a lengthy conversation. That dirt can accumulate and cause breakouts on your skin.
Under-Eye Circles: The LED light from your mobile phone can affect the way you sleep. The blue glow emanating from computer, cell, and tablet screens can throw off your internal sleep rhythm, meaning it's harder to fall asleep and you spend less time in REM sleep. Not to mention the incessant notification chimes from social media, email, and text.
Dark Spots: Remember talking to your high school boyfriend late at night until your phone burned your cheeks? Well, that overheating can cause major skin issues. The added heat can mess with your melanin production, causing dark spots and discoloration to form.
Source: www.stylelist.com