He is suffering from aggressive vitiligo &it is very high possibility that there may be some familial history also irrespective of that and looking to his aggressive disease course it is strongly recommended to act fast .
Next Steps
start homoeopathic medicines as soon as possible with an expert homoeopath
Health Tips
check for special stress of your child like anger and aggression and manage it with appropriate handling as it is seen that in almost autoimmune diseases has its basis in stress and aggression and there are no doubts that homoeopath y can cure it .