What condition could contraindicate the use of a chemical relaxer?

The use of a chemical relaxer could be contraindicated by an open wound or scalp infection because applying harsh chemicals to an area that is already compromised can lead to further irritation or exacerbate the condition. Chemical relaxers work by altering the structure of the hair, which can cause additional stress to the scalp and open wounds. This can increase the risk of chemical burns, infection, or other adverse reactions. Ensuring the scalp and hair are in a healthy condition prior to applying any chemical treatments is crucial for the client's safety and comfort.

While dry hair and color-treated hair may present challenges during the relaxing process, they do not inherently contraindicate the use of a relaxer. Curly hair is the typical type of hair that chemical relaxers are designed to treat, making it irrelevant as a contraindication in this scenario.