What is the difference between contagious molluscum and flat warts?

The differences between molluscum contagiosum and flat warts are mainly reflected in the following aspects: 1. Etiology: Molluscum contagiosum is caused by infection with the molluscum contagiosum virus (MCV), while flat warts are caused by infection with human papillomavirus (HPV). 2. Symptoms and clinical manifestations: The typical symptom of molluscum contagiosum is the appearance of waxy, glossy hemispherical papules on the skin, with a central umbilicated depression, from which a cheese-like molluscular body can be expressed. It commonly affects children and young adults and can occur on any part of the body, primarily on the trunk and limbs. Flat warts present as firm, flat papules with a rough surface, appearing either singly or in multiples, primarily occurring on exposed areas such as the face, dorsum of the hands, and forearms. 3. Transmission routes: Molluscum contagiosum is mainly transmitted through direct contact or sexual contact, while flat warts are primarily spread through skin abrasions or scratches. 4. Disease course and treatment: Molluscum contagiosum has a relatively longer disease course, usually requiring several weeks to several months for resolution. Treatments include curettage of the lesions and the use of antiviral medications. Flat warts have a relatively shorter disease course, typically resolving spontaneously within several months. Treatment options include topical medications, laser therapy, or cryotherapy.