 | Diseases And Conditions 331 Ask the Doc Q&A I got a tan on my face. But now I also have white patches on my face. What can cause this? I got a tan on my face. But now I also have white patches on my face. What can cause this? htmASKTHEDOCmelaninwhitepatcheswithtan Skin color is determined by melanin, which is produced by skin cells called melanocytes. When these cells are exposed to the sun, they produce more melanin. This results in a tan. 1459562 InteliHealth 2012-10-26 t Rebecca Campen, M.D., J.D. 2015-10-26  | Ask The Expert | |  |  |  |  | | Archive By Date: Ask the Doc Q&A | Page 1 of 4 | | Answered questions from the past 2 years: | |  Is there any connection between blood sugar levels and memory loss? |  I have costochondritis. What causes this? Ive had no injury, but lots of stress and mental health problems. Can stress bring this on? Is this chronic? |  I have frequent headaches. I dont like taking pain relievers. Ive been told that vitamins can help prevent headaches. Is this true? What about other natural products? |  y 13-year-old daughter has been diagnosed with a hemangioma. It looks like a wart, and about the size of a pencil eraser. Its just above her left armpit on her shoulder. What would cause this to happen? Is there anything we should be concerned with? Should it be removed or will it go away on its own? |  My six-month-old daughter started to have seizures. She had 3 on Thursday, 20-30 on Friday, 2 on Saturday and none since then. All she does is stop, roll her eyes to the back of her head and then cry. We are waiting on the results of an EEG. But can you give us more information on what could be happening and why? |  I recently had a severe reaction to amoxicillin. I had to go to the hospital, where I was given Benadryl and cortisone through an IV. My doctor tells me that I now have "serum sickness." I have joint pain, fatigue and headaches. What exactly is serum sickness? |  When youve have a cold or the flu, how do you know when it's safe to continue a routine exercise program? |  Recently Ive been staying up until 3 or 4 in the morning to work on my oil paintings. I know I should feel tired, but I dont. One of my friends said that I might be hypomanic. What is that? |  I was not able to pass urine after having a pacemaker put in. I was sent home with catheter attached to a bag. I have a follow-up appointment with the urologist. What if I still cant pass urine after the catheter is removed? Id prefer not to have surgery. What are my options? |  Do adult women that is, not just teenagers have problems with eating disorders? | | | | |