Severe form of dandruff, called as seborrhoeic dermatitis, may lead to inflammation and infection of the scalp to make you experience symptoms like itching, redness, boils, hair fall.
Next Steps
Meet a dermatologist (me) to be able to treat you for the current concerns, and let you know in detail about the needed lifestyle modifications responsible for the condition.
Health Tips
External oil application may worsen dandruff.