Hairloss since past 3-4 months

Patient: I am a 20 yr old boy. Past a couple of months i am having hairfall.I dont know what is wrong. There is a bit of dandruff in my hair. I have started taking multi vitamins but i dont see any results. Kindly help me.

Symptoms: Mild dandruff and white substance in my nails when i scratch my head.

Doctor: