Sticky dandruff, also known as wet dandruff, is a common scalp condition where flakes are oily, heavy, and yellowish instead of dry and white. "Overproduction of sebum is one of the primary reasons...and when this interacts with fungus...dry dandruff turns into thick clumps," Dr Ankur Sarin, Dermatologist at Sarin Skin Clinic in New Delhi, said.