They grow in clusters, up to 100 in one area. Some children get them on the face. They are more common on women's legs and in the beard distribution of men. Sometimes they do. Other times they do not.
Warts are unpredictable.
No one knows why some warts disappear on their own and others do not. Different types of warts are treated in different ways. The drug must be applied every day for several weeks. The dead surface may be filed down as the wart is treated. Better results are obtained if the acid is applied after a shower when the skin is damp.