US B2 visa appointment question

Hi

My wife has a US visa appointment in the next few days and I just noticed she has the remnants of a blister on her thumb. It's a few weeks old so has dried up but some of the skin there in hard and there's a mark still there.

I read that when taking fingerprints, if you have any cuts or blisters then the application doesn't get processed and you have to reschedule.

Does anyone have any experience with this and is it really that strict?

Thanks

I don't have experience with this, but would advise you reschedule if the blister hasn't completely healed & disappeared. The reason being, that is what will be recorded on her biometric record, and checked against very time she attempts to enter the US, so there is the potential that her finger prints may not match because of this in the future - when the blister has disappeared. Hopefully that explanation makes sense.