I've had it for years. Then I was diagnosed with Type 2 Diabetes. I tried changing my diet to suit the diabetes - low carbs, whole wheats, leafy greens - and my IBS flared up so badly. It was bad before I started taking my metformin/glucofage but it got increasingly worse when I changed my diet for the diabetes.
Newborns are also coated with a thick, pasty, white material called vernix caseosa (made up of the fetus' shed skin cells and skin gland secretions), most of which will be washed off during the baby's first bath.
A wild cottontail (US) rabbit that is not old enough to be weaned yet, may have a white spot on its forehead. Some babies are born without any spot. Some rabbits will retain the blaze throughout life and others will lose it as they age.