White Patch On Face

my son 9 years has appread a minor white patch near lips. i remember he has appeared that earlier too, n went to child specialiat as well but dont remember the recommendations. i want to know is this due to some deficiency?

dr-gulab-rai-pediatrician-karachi

MBBS , MCPS (Peads) | Karachi

kindly show the picture it will be helpfull for us..

dr-danish-aftab-pediatrician-karachi

show picture of child