Which of the following is a common cause of folliculitis in children?

A. Allergic reactions, such as contact dermatitis or urticaria, can cause redness, itching, or hives, but they do not specifically involve the hair follicles. Folliculitis is characterized by inflammation of the follicular unit, which allergic reactions alone do not produce. While irritation from an allergen can sometimes exacerbate follicular inflammation, it is not a primary cause of folliculitis. B. Fungal infections, such as tinea capitis or tinea corporis, affect the skin and hair shafts and present with scaly, circular patches, hair loss, or mild erythema. These infections do not typically produce pustules or papules centered on hair follicles, which is the hallmark of folliculitis. While secondary fungal infection can rarely complicate folliculitis, it is not the common cause in children. C. The most common cause of folliculitis in children is bacterial infection, especially by Staphylococcus aureus. The bacteria infect the hair follicles, leading to small, red pustules or papules, sometimes with surrounding erythema. Lesions are often tender or mildly itchy and may occur on the scalp, neck, arms, or legs. Folliculitis can arise from poor hygiene, occlusive clothing, friction, or minor trauma to the follicle. Treatment usually involves topical antibacterial agents, improved hygiene, and in more severe cases, oral antibiotics. D. Viral infections, such as herpes simplex virus, may cause vesicular lesions, often grouped and painful, but they do not specifically target hair follicles. Viral infections rarely present as folliculitis in children, and the pattern of inflammation differs from bacterial folliculitis. Viral causes are not considered a common etiology.