Is your scalp itchy? Here are the main causes.

Avoid scratching to prevent further skin irritation.
Pityriasis usually heals on its own within a few weeks.
Fungal infections: if the redness persists.
Fungal infections such as tinea capitis (scalp ringworm) cause itching, accompanied by redness, scaling, and sometimes localized hair loss.

What to do?

Consult a dermatologist for an accurate diagnosis.

Follow an oral antifungal therapy and use special shampoos.
Continue treatment even if symptoms improve to prevent recurrence. Chemical reactions: Be careful with hair dyes.
Hair coloring can cause allergic reactions: itching, redness, burning, or even blistering. A common trigger is paraphenylenediamine (PPD), an ingredient often found in hair dyes.