Idaho Cosmetology Licensure Practice Exam

Frequent scratching of the scalp is a primary sign that a client may have lice. This behavior typically stems from the irritation caused by lice bites, which can lead to intense itching. When lice infest the hair and scalp, their presence can provoke an allergic reaction to their saliva, causing discomfort and prompting individuals to scratch.

While other options might suggest scalp issues or discomfort, they do not specifically correlate with the presence of lice. Dry skin, for instance, may lead to flaking but doesn't result from lice infestation. A red and inflamed scalp can indicate various conditions, such as dermatitis or an allergic reaction, but it is not definitive for lice. Excessive hair oil might be used for various styling or treatment purposes, but it does not serve as an indicator of lice presence. The scratching, therefore, is the most direct observable behavior associated with lice infestations and is a key signal for further examination.