Depression: Many people who have acne suffer from more than low self-esteem. Acne can lead to a medical condition called depression. The depression can be so bad that people think about what it would be like to commit suicide. Many studies have found that teens who believe that they have “bad” acne were likely to think about committing suicide. Dark spots on the skin: These spots appear when the acne heals. It can take months or years for dark spots to disappear.