What condition may arise from a build-up of sebum in hair follicles?

A build-up of sebum in hair follicles can lead to acne, which is a common skin condition. When excess sebum, along with dead skin cells, clogs hair follicles, it creates an environment conducive to the growth of bacteria. This can cause inflammation and result in the development of pimples, blackheads, and other types of blemishes associated with acne.

In contrast, alopecia refers to hair loss, which is not directly related to the accumulation of sebum. Eczema is characterized by itchy, inflamed skin, often due to allergic reactions or irritants rather than clogged follicles. Psoriasis involves rapid skin cell turnover leading to thick, scaly patches and is not caused by sebum buildup. The connection between excess oil and acne is well-established in dermatology, making acne the correct choice in this context.