Hello my 11 year old son had very chapped lips and got into the habit of licking them frequently. We a have given several different types of chap stick / lip moisturizer . His lips now are much better but he has a very dark circle of skin around his mouth. His skin is brown but the circle is much darker than his skin and is very noticeable. He has continued to apply OTC medicated chap stick several times a day. He said the dark circle burns and the chap stick helps a little. What else can we do to correct this problem and remove the dark circle around his mouth? Thanks