Even ‘natural’ fragrances can cause trouble, citrus being one of those. The most notorious allergens in hair care products responsible for allergic reactions include the fragrances and preservatives. ![]() Hair care products are full of allergens that can cause allergic contact dermatitis. It can take days or weeks, and often happens after a person has successfully tolerated an ingredient or product in the past. Familiar type 4 delayed hypersensitivity reactions include poison oak or poison ivy, which produce the classic and severe form of allergic contact dermatitis in many people.Īllergic contact dermatitis is at first a slow type of allergy that builds into a rash. The allergic contact dermatitis rash you get from hair care products is also called type 4 delayed hypersensitivity reaction. It is different than hives (or welts), which many people associate with allergic reactions. You can even have the rash running down the top of your back where shampoo and conditioner rinse down from your scalp. You expect the rash on your scalp, but it can also happen on the skin of your face, on and behind your ears, and on your neck. ![]() The skin can even develop small blisters when the reaction is really bad. The rash will be red, itchy and scaly at skin sites that touched the allergen. The allergic reaction to hair care products is typically on the skin. What does an allergy to hair care products look like?
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