Acanthosis nigricans or dirty looking skin behind the neck is linked with Obesity and Diabetes.
Main stay of treatment is weight management.
Often parents don't realise, child is overweight and soon will be Obese. Grandparents usually reject all suggestions and say his father at his age was just like that.
Realisation of problem is the first key to success in our carbohydrates-loving people.
Obesity is rarely because of some disease but is by product of lifestyle and eating pattern.
It's my request from all parents to check discrepancy between height and weight of child. Your realisation regarding weight will prevent many diseases in your child.