Anaphylaxis after using hair dye

Hair dye ingredients can cause contact dermatitis, which more often brings itching, burning, redness, blisters or swelling where the product touched the skin. Anaphylaxis is a whole-body allergic emergency and may present with wheezing, throat tightness, trouble breathing, dizziness, collapse, or symptoms affecting several body systems.

Facial or eyelid swelling deserves prompt medical assessment because it may progress and can be difficult to distinguish from a more serious reaction. Anaphylaxis can occur without a rash. Symptoms may begin while dye is being applied or after the product has been rinsed away.

If anaphylaxis is suspected, use the prescribed adrenaline auto-injector at once and call emergency services. Tell the dispatcher that hair dye exposure may have triggered anaphylaxis. Keep the person flat and do not allow standing or walking; adjust the position only for breathing difficulty, vomiting or unconsciousness.

Stop applying the product. If this does not delay emergency treatment, rinse dye from the hair and skin with plenty of lukewarm water and avoid rubbing irritated areas. Do not rely on rinsing, antihistamines or steroid creams to control airway swelling or shock.

Emergency warning signs include noisy or difficult breathing, swelling of the tongue or throat, a hoarse voice, persistent cough, faintness, confusion, collapse, or pale, blue or grey colouring. Rapidly spreading swelling or a combination such as hives with vomiting and breathing symptoms also warrants an emergency response.

Go to an emergency department after adrenaline is used, even when symptoms settle. Observation matters because a reaction can return. Bring the product packaging or a clear ingredient photograph if it is safe to retrieve, but never delay departure to collect it.

Avoid reusing the suspected dye until an allergy specialist has assessed the reaction. Ask whether patch testing is suitable, which ingredient names to check, and whether related products should also be avoided. A salon patch test cannot show that a future exposure will be harmless and should not replace specialist advice after a severe reaction.