Name a contraindication for using chemical relaxers.

Chemical relaxers can alter the hair's structure and pH balance; therefore, it is critical to avoid using them on clients with scalp irritations. When the scalp is irritated, applying a chemical relaxer can exacerbate the condition, leading to discomfort, burns, or even more severe reactions. The skin barrier is compromised during irritation, which increases the risk of chemicals being absorbed into the bloodstream, potentially causing systemic issues. For these reasons, if a client has scalp irritations, it is advisable to postpone any chemical treatments until the scalp has healed.

On the other hand, while dry scalp and color-treated hair may require careful consideration before applying relaxers, they are not absolute contraindications. Healthy hair, in fact, can generally tolerate chemical treatments more effectively, making the option highlighting scalp irritations the clear choice for contraindications.