What is vital to check on a client's skin before performing a hair treatment?

Checking for the presence of allergies on a client's skin before performing a hair treatment is crucial because certain hair products or treatments can contain ingredients that may cause allergic reactions. Allergies can range from mild irritation to severe reactions that might necessitate immediate medical attention. By ensuring the client is not allergic to any ingredients included in the products that will be used, you minimize the risk of adverse effects and ensure a safer experience.

While skin texture, color preference, and hair thickness are all important factors to consider in the treatment process, they do not carry the same level of immediate health risk as allergies. Skin texture may affect the application technique, color preference helps to tailor the service to the client’s desires, and hair thickness can influence the choice of products. However, the priority should always be the safety of the client through the identification of any potential allergies.