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Contact dermatitis is an inflammation of your scalp caused by an allergy-producing product. The most publicized reaction, and the most severe, is anaphylaxis from hair colouring. However, this only occurs in a very small percentage of people. More commonly, contact dermatitis produces a milder reaction characterized by eczema-like irritation of the scalp.
It can be brought on by sensitivity to a specific ingredient in one of your hair products, chemical straightening, hair dyes, stress, an existing or newly-acquired food intolerance, or the combination of the products you use to style your hair.
Patch-testing can often determine the cause of contact dermatitis, so the irritant or allergen can be avoided. However, this can sometimes be difficult if either is a commonly circulated ingredient.