An itchy forehead may be caused due to skin conditions like eczema, contact dermatitis, dandruff, and acne. Certain cosmetic products may trigger itching due to an allergen. Other causes include sunburns, stress, and pregnancy. The symptoms include burning, dryness, redness, scaling, and itching etc. Washing your face with cold water, using aloe vera gel, applying sunscreen may help ease the symptoms.