Scalp Allergy: What are the symptoms?

Allergic reactions of the scalp can cause various symptoms, sometimes localised solely to the scalp, sometimes extending to the face, the back of the neck or the neck itself.

• Scalp allergy can cause itching.
  Itching, accompanied by a sensation of irritation or tingling, is often the first sign of a scalp allergy. Although it is easier said than done, one should try to refrain from scratching the itchy area as this contributes to prolonging the itchiness. If the urge to scratch is too strong, gently massage your scalp or apply cold using a compress. The itchiness experienced during a scalp allergy is caused by the release of inflammatory mediators which stimulate the nerve fibres in the scalp and thus trigger the sensation of itching.

• Scalp allergy is often characterised by redness.
  Typical of an inflammatory response, this redness allows for the visual identification of the area in contact with the allergen. Depending on the hair density of the individual affected by the allergy, the redness may be more or less visible. The redness is caused by a dilation of the blood vessels in the dermis due to the effect of histamine. This increases blood flow and causes a warming sensation in the scalp. The inflammation can also make the skin sensitive to touch and persists as long as the allergen has not been eliminated from the hair care routine.

• Scalp allergy can lead to a burning sensation.
  Following a severe allergic reaction, it is possible to experience a burning sensation on the scalp, also triggered by inflammatory mediators. This painful feeling results from a hypersensitisation of the scalp's nerve endings, making the area temporarily more responsive to any external stimulus, whether it be touch or the heat of a hairdryer. In case of a persistent burning sensation, it is advisable to consult a healthcare professional to prevent the allergy from worsening.

• Scalp allergy is sometimes characterised by crusts and flaking.
  Finally, the appearance of small crusts and scales can be indicative of a scalp allergy. Indeed, in the context of an allergy, the immune response triggers a rapid cellular renewal, causing an accumulation of dead cells on the skin's surface. Similar to dandruff, these scales can clump together and form thick plaques and, in some cases, crusts. Even though it may be tempting, it is better to refrain from scratching them, so as not to make the scalp more vulnerable to bacterial and fungal infections.

How to respond in the event of a scalp allergy?

The first step to take when dealing with a scalp allergy is to identify the product causing it and cease its use. To do this, we advise you to test each of your hair care products one by one separately to determine which is responsible for your reaction. Concurrently, if the allergy is too bothersome, it is recommended to consult a general practitioner or a dermatologist in order to receive antihistamines or soothing creams to alleviate the allergy.