A more severe form of the flaking of scalp, which includes inflammation of the skin, is known as seborrhoeic dermatitis. Dandruff is a skin condition that mainly affects the scalp Seborrhoeic dermatitis affects not only scalp but also face (eye-brows, naso-labial crease, earlobes and beard), underarms, centre of back and chest and sometimes groins. Patients with dandruff have thin, dry, and fine flakes while patients with seborrhoic dermatitis tend to have oily skin and also large, thick and oily flakes. Dandruff and seborrhoic dermatitis become worse in dry and cold climate.