Milady Cosmetology Practice Exam 2026 – All-in-One Guide to Master Your Cosmetology Certification!

Pityriasis, often referred to in the context of conditions like dandruff, is characterized by the excessive shedding of skin cells from the scalp. This condition is primarily caused by an overproduction of skin cells, leading to flaking and irritation. The irritation and exfoliation associated with pityriasis can be more noticeable because it involves the scalp's response to factors such as yeast (Malassezia) that thrive on the scalp and can cause a buildup of dead skin cells.

When considering other potential causes, like fungal infections, they can result in irritation but are often less common than mild to moderate cases of pityriasis. Dry skin can also contribute to irritation, but it is not specifically associated with the noticeable scaling and flaking typical of pityriasis. Oil buildup can lead to issues like greasy scalp and clogged pores, but it does not typically result in the type of extensive irritation and exfoliation seen in pityriasis. Therefore, pityriasis emerges as the most common cause of scalp irritation and exfoliation due to its prevalence and distinct symptoms.