I am a generally healthy 47yo male, I recently noticed darkening on my navel area, and it has slowly increased on the last couple of weeks, is evenly spreading downwards! the only medical conditions I am aware of is a current investigation regarding IBS and about 3 years ago after a car accident I had some some of band placed to hold my stomach and guts on place (i fell no discomfort on the surgery area)! what can it be