It could be sebborheic dermatitis. Try using Head and Shoulders for a week or two and see if that helps to loosen up and get rid of the flakes.
2b or 2c, Fine, Thick, Low Porosity

shoulder length, flat on top, waves to curls through the bottom half with better curls underneath

Currently using- DevaCurl Lo-Poo, One Conditioner, and AnGel