Molluscum Contagiosum in Children and Immunocompromised Patients

Overview / Definition Molluscum contagiosum is a common viral infection of the skin caused by the molluscum contagiosum virus (MCV), a member of the Poxviridae family. Characterized by the appearance of small, painless, dome-shaped papules with a central umbilication, this condition is predominantly seen in children but can also affect immunocompromised individuals. Epidemiology Molluscum contagiosum is one of the most prevalent skin infections in children, particularly in those aged 1 to 10 years. The incidence is higher in crowded settings such as daycare centers and schools. In immunocompromised patients, the prevalence is significantly higher due to their impaired immune response. Prevalence is highest among children aged 1-10 years. Common in immunocompromised patients, including those with HIV/AIDS or receiving immunosuppressive therapy. Transmission occurs through direct skin-to-skin contact or fomites. Pathophysiology / Mechanism The molluscum contagiosum virus infects epidermal keratinocytes, leading to the characteristic lesions. The virus is transmitted through direct contact, and once it infects the skin, it induces a local inflammatory response, causing the formation of lesions. The lesions are caused by viral replication within the epidermal cells, resulting in cellular hypertrophy and a characteristic dome-shaped appearance. Clinical Presentation Molluscum contagiosum typically presents as: Small, firm, flesh-colored or pearly white papules. Central umbilication or dimple. Lesions are usually asymptomatic but may become itchy or inflamed. Commonly found on the face, trunk, and extremities. In immunocompromised patients, lesions may be numerous, larger, and more widespread, possibly resembling other skin conditions. Diagnosis / Workup The diagnosis of molluscum contagiosum is primarily clinical, based on the appearance of the lesions. In atypical cases, a biopsy may be performed to rule out other conditions. Key diagnostic points include: Characteristi