Do I have DUPA (Diffuse Unpatterned Alopecia)? I am 19 years old male and experiencing hair loss for 4 years.

You need to meet with a dermatologist and get examined with a hand microscope, The doctor will look for exclamation hairs which if h finds, will then get a biopsy to confirm the diagnosis 

This requires an in-person evaluation. I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone and/or hair transplantation. See an expert. Best, Dr. Emer

If you dont touch and damage them routinelly undamage my hair follicles are able to regrow again . But ıf hair follicles had a persistant damage by pulling force, you have to get a hair restoration surgery to get them back .

Pain and tenderness can be variable. This requires an in-person evaluation. I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone and/or hair t...

This requires an in-person evaluation. I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone and/or hair transplantation. See an expert. Best, Dr. Emer

Although this is not a common side effect of finasteride/propecia, everyone is unique and may react differently to medications. I recommend discussing this with your doctor. In general, finasteride is a well-tolerated medication for most patients. For my patient's who do experience a side ef...