Dry Skin Build-Up on Scalp

Dr Rassman,
I am 24 years old and have been experiencing hair loss since last Sept. I have been on Propecia since Oct. and have since seen less shedding and some slight improvement. What is the most distressing is that I have diffuse thinning all over the top and crown of my head and, most terrifying, no family history of hair loss. My question is this, I have a lot of material build up in my scalp, what I think is white, dry skin, or it could be i’m just not washing my hair thoroughly enough, whatever it is, it’s very noticable and when i try to brush it out, hair sheds along with it, especially when I try to style hair in the front and on the bangs. I have been using T-Gel and the amount of build-up is less however there is still some on the scalp. Is this affecting my chances of hair regrowth? And do you have any recommendations?
Thanks

Sorry, I cannot diagnose your condition over the internet with just descriptions. You need to see a doctor who specializes in hair (like hair transplant doctor) or a dermatologist if you feel you have a skin problem.