A woman in her 40s was disturbed by the acne on her face that had appeared recently and had not existed before. That's why she went to be examined by a dermatologist. The doctor started asking the woman questions, thinking about the reasons that cause acne at this age. The doctor asked the woman, Have you consumed packaged foods and dairy products lately? The woman said no. The doctor said, Okay. He asked the woman, Have you used vitamin B12 or cortisone medication recently? The woman again answered no. The doctor thought a little more and asked the woman, Have you started using a new medication in the last month? The woman said, Yes, I was diagnosed with bipolar disorder and started lithium treatment 3 weeks ago. The doctor said lithium. He stated that the medicine could cause acne and gave a cream treatment. The woman was happy and thanked for the question mark in her mind was resolved and she received the treatment.