17yo ds has a wart on the outer side of a little finger joint. It's been there for several months and I would leave it alone, but he has developed a habit of chewing it, so I'm worried it may spread to his lips. He has agreed to me freezing it off.
Ds is autistic, so I have one chance of getting this right. If it goes wrong, he will not let me try again. (It's also the reason there's no point just telling him to stop chewing the wart. He knows why he needs to not chew it, but it is an entrenched behaviour that he just cannot stop.)
I've removed warts and verrucas from toes, soles and heels before, but never from fingers, and never from directly over a joint. And, just to add spice, it's on his dominant hand.
Any tips? Which brand, technique, aftercare etc?