Hello, it might be due to simple dryness or fungal infection or Psoriasis also. Consult your nearest dermatologist for better diagnosis and management.

Thanks for the query. Severe dandruff could indicate dandruff itself which is significant or can indicate beginning of some other skin condition like Seborrheic dermatitis or Scalp psoriasis. Kindly consult a dermatologist for exact diagnosis and treatment plan. It is also important to prevent their relapse once you have got it cured. A decolonization regimen suggested by your doctor will help.