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

Oily hair and scalp are primarily caused by overactive sebaceous glands. These glands produce sebum, which is the natural oil responsible for keeping hair and scalp moisturized. When these glands become overactive, they produce an excess amount of sebum, leading to a greasy or oily appearance in the hair and scalp.

This condition can be influenced by several factors, including hormonal changes, diet, stress, and genetics, which can stimulate the sebaceous glands to produce more oil than normal. Understanding that this overproduction is the fundamental cause helps identify appropriate treatment options, such as using specific shampoos designed to manage oiliness.

In contrast, improper washing or dry scalp does not cause oily conditions; rather, they might contribute to dandruff or dry hair. Underactive sebaceous glands would lead to dry hair and scalp, as there wouldn’t be enough oil to keep the hair adequately moisturized. Hair product buildup can also lead to a greasy appearance but is often a result of excessive product use, rather than the root cause of oily hair and scalp. Thus, identifying overactive sebaceous glands as the primary cause allows for targeted intervention and management of oily hair.