Over-the-counter shampoo is the most frequently used treatment for a dry, itchy scalp, according to HowStuffWorks. This is usually effective, but topical medications and laser treatments are available depending on the cause of the itchiness and dryness.
Some types of dry, itchy scalp, such as folliculitis, often require no treatment and clear up in a couple of days on their own, explains HowStuffWorks. Ringworm, another condition that causes dry and itchy scalp, always requires treatment with an oral antifungal medication. Lice, another cause an itchy, dry scalp, is usually treatable by using over-the-counter remedies but may require prescription shampoos or lotions. Dandruff often responds to over-the-counter shampoos, but a prescription shampoo or steroid lotion may be required in some cases.
Psoriasis may also cause a scalp to be itchy and dry, reports HowStuffWorks. Over-the-counter remedies work well in most cases. If these remedies do not work, a doctor may try a topical medication designed to clear up the area. If the treatment is still unsuccessful, light therapy is an option, and it can be done as a laser or as a non-laser treatment. The laser treatment involves use of an excimer laser that focuses on the areas of psoriasis without damaging nearby skin. The Federal Drug Administration has also approved a variety of prescription medications for psoriasis.