Acne is a very common skin condition – about 85% of people will suffer from it in their lifetime. With the abundance of over-the-counter acne treatments available today, it can be easy to forget that acne is not just a cosmetic problem. It is a real medical issue that often needs to be addressed by a health professional. Given that, how do you know if you should see a dermatologist about your acne? Here are 5 signs you should look out for to answer that question.