Flat warts, like common warts, are raised skin lesions caused by the human papillomavirus (HPV). The surface is usually flat and smooth, with no obvious discomfort, and they commonly appear on the faces and backs of hands of adolescents. They often develop slowly and are benign. They can be cured and pose no serious harm.

bubble_chart Clinical Manifestations

1. Generally, there are no subjective symptoms, occasionally with slight itching;
2. The skin lesions are flat, smooth papules ranging from pinhead-sized to mung bean-sized or slightly larger, round, oval, or polygonal in shape, firm in texture, and normal skin-colored or light brown.
3. It mainly affects adolescents and is commonly seen on the face, back of the hands, and forearms.

bubble_chart Diagnosis

1. It commonly occurs on the face, back of hands, and forearms in adolescents;
2. the skin lesions are flat papules of normal skin color or light brown with a smooth surface;
3. they can self-inoculate due to scratching and arrange in a beaded pattern along scratch marks.

bubble_chart Treatment Measures

Principles of Treatment

1. Intramuscular injection of polyinosinic-polycytidylic acid or oral administration of levamisole, urotropine, etc.;
2. Liquid nitrogen cryotherapy or laser treatment;
3. Topical application of podophyllin, wart remover, etc.

1. For flat warts with few skin lesions, topical medication is the main treatment.
2. For generalized flat warts, immunotherapy may be administered.

bubble_chart Cure Criteria

1. Cure: Skin lesions completely resolved;
2. Improvement: Partial resolution of skin lesions with no new lesions;
3. No cure: No resolution of skin lesions, or new lesions appear.