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There are many different causes of itchy scalp that require different treatments.
But first, let's treat the symptom:
-- Ask your doctor if you can take an antihistamine such as Zyrtec. Also, apply a topical antipruritic (anti-itch) such as Lanacaine, which contains Benzocaine.
Now, cure the cause:
-- Mold, from leaving the hair damp after washing. Wash in tepid (not hot) water, because hot water antagonizes nerve endings. Dry thoroughly and comb often to spread natural oils. Resist temptation to scratch while combing by having someone comb the hair.
-- Fungus such as yeast. Use the shampoo form of Ketoconazole at prescription strength.
-- Bacteria, looks like acne. Use a shampoo containing Zinc pyrithione.
-- Dry skin from too little water intake. Use moisturizer.
-- Lice from a visiting child. Look for tiny (nearly microscopic) bugs attached to the hair very close to the scalp. Kill for 3 days with permethrin in NIX, which is OTC. The best discussion is at
Head lice - PubMed Health.