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Tinea capitis is a contagious fungal infection of the scalp characterized by scaly patches, broken hairs (“black dots”), or inflamed lesions. Because it is communicable and involves compromised skin integrity, clients exhibiting signs of tinea must be refused service and referred to a licensed healthcare provider for diagnosis and treatment before any salon procedure, especially chemical services. Proceeding could spread infection to tools, the environment, and other clients, and it risks exacerbating the client’s condition. By contrast, oily scalp or basic dandruff (pityriasis) may warrant supportive care (appropriate cleansing frequency, medicated shampoos per label) but are not absolute contraindications to all services. Low porosity affects product penetration—requiring adjustments such as higher alkaline products or longer processing—but it is not a health contraindication. Proper consultation includes a thorough scalp and hair analysis, documentation of findings, and adherence to state sanitation and exposure control standards. When in doubt, err on the side of client safety and refer.