What are the grains w/ seborheic dermatitis made of?why is it that it helps to remove them while treating ?what effect are they causing? can elaborate

Seborrheic Derm: One characteristic of this disorder is the increased growth rate of the surface of the skin, leading to fragments of surface keratinized cells that break off. Because of the altered growth, they hold together differently than normal-- grains as you say. Removal helps to make it easier for any topical treatment to reach the site of the increased proliferation in the base of the epideremis.