Why is it important to know a client's allergies before beginning a treatment?

Understanding a client's allergies prior to beginning a treatment is crucial primarily to prevent allergic reactions. Allergic responses can vary from mild irritations to severe conditions, making it vital for a cosmetologist to be informed about any allergies a client may have to specific ingredients or products. This knowledge allows the cosmetologist to select appropriate products and avoid those that could trigger an adverse response, ensuring the client's safety and comfort.

Being aware of allergies not only helps in preventing potential medical emergencies but also fosters trust between the client and the cosmetologist. Clients will appreciate the diligence and care taken to safeguard their health, which can enhance the overall experience and satisfaction with the services provided.