My son has a black discoloration under the nail on his left thumb and it's a little hard... And my son sucks his finger all the time and because of the sucking, he has a bite mark on his finger. Is this something to be afraid of?

A. It is not good if your child is sucking on the thumb all the time like this is actually to damage the skin and tissue inside of it so kindly get rid of this habit either apply something on the thumb of your child child or keep counselling your child through and through