Hi, itchy scalp with dandruff could be a sign of seborrhoeic dermatitis. Androgenetic Alopecia is the most common cause of hair fall in males. It is usually because of hereditary factors along with nutritional deficiencies and stress. You could get good results with oral medication and non surgical options.
Next Steps
You could consult me directly online with pictures for proper treatment and guidance
Health Tips
Maintain good scalp hygiene.
Use an antidandruff shampoo once a week
Have a high protein diet
Take an antioxidant supplement with biotin