dandruff and white lumpy things

[yesterdayoncemore]

Dear doctor,

I really hope you can help me. Im 18, and have been losing hair for about 5 months now. This is some info:

-My scalp does fall slightly into the oily category
-I have quite alot of dandruff (could this be the reason?)
-I notice in quite alot of my fallen hairs that at the root is a white lump, somehwat like accumulated dandruff. Is this excessive sebum?

PLease please please help me, thank you so much!