Question: are all filiform warts caused by hpv?
Answer: What causes filiform warts? HPV is the cause of filiform warts. There are over 100 strains of HPV, but only a few strains (1, 2, 4, 27, and 29) are known to cause filiform warts. If you're infected with one of these strains, it doesn't necessarily mean you'll get filiform warts.