The hands and fingers are common sites. Thrombosed capillaries which appear as black dots can be seen on the surface of some warts. This can be clearly seen in a higher magnification view . Flat warts are caused by HPV types 3 and 10. They are round or oval shaped, slightly elevated and sharply defined.
Flat warts appear as skin colored sometimes pink or brown papules with a flat surface.
Size can vary from 2 to 4 mm. Multiple lesions generally occur. This can be clearly seen in a higher magnification view . Auto inoculation by scratching can result in linearly grouped lesions. The face and hands are common sites.