Itchy scaly scalps are common in the winter.  The technical term is seborrheic dermatitis or dandruff.  Easy over-the-counter dandruff shampoos are helpful to prevent and ease the symptoms.  Start by using 2 or 3 different over the counter dandruff shampoos and rotating their use every day. Any conditioner to soften the hair fiber can be used after shampooing.  If this remedy after 1-2 weeks is not helping, have your dermatologist evaluate for other conditions.