I have had a crack down the middle of my head all my life but recently numerous small hard and painful bumps and divots have shown up on either side?

Skull suture w/rash: Some people have persistent frontal sutures. During development the skull of an infant is made up of bony plates that allow for the growth of the skull. The places where these plates connect are called suture lines. Some people grow up without having complete fusion of the 2 frontal sides of the skull. The dense connective tissue ridge remains. Looks like crack down middle of forehead. Go to derm.