2/3 resolve within 2 years. In young children, higher spontaneous clearance. In systematic review, only salicylic acid and aggressive cryotherapy seem to be effective. Both are user dependent. In RCT between the 2 and conservative management, no difference detectable after 13 weeks. So watch and wait, unless causing a lot of pain.
Perianal warts can be transmitted vertically from mother at birth, or potentially from carers changing nappies.
Warticon cream is podophyllotoxin. Else Condyline paint.