The problem: 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.
The solution: Don't let your phone rub against your face for too long. If you're in a private area, put your cell in speakerphone mode or switch to bluetooth for lengthier conversations.