What scalp condition should be present to indicate that a chemical service should NOT be performed?

Scalp abrasions indicate areas where the skin is broken or damaged, which can lead to increased sensitivity and the potential for irritation or infection when subjected to chemical services. Performing a chemical treatment on a scalp with abrasions can exacerbate these issues, causing pain or severe reactions. Chemicals used in treatments can penetrate broken skin more easily, leading to complications that could arise from direct exposure to the products. Therefore, the presence of scalp abrasions is a clear contraindication for chemical services to ensure the client's safety and comfort.

In contrast, while a dry scalp may be uncomfortable or require treatment, it does not inherently pose the same immediate risks as abrasions do. An oily scalp can also be treated with a variety of services, and dandruff, while indicative of flaking, does not present the same health concerns that would necessitate avoiding a chemical service. Thus, the presence of scalp abrasions is the primary concern that should prevent the execution of chemical treatments.