There are a number of different treatments that can be effective for dry scalp, depending on the cause. If your dry scalp is due to a lack of moisture, you may benefit from using a leave-in conditioner or hair mask. If your dry scalp is caused by dandruff, you may want to try an anti-dandruff shampoo. Finally, if your dry scalp is due to an underlying medical condition, you should speak to your doctor about treatment options.