does temporary decoration such as mehndi cause issue in biometric scan?

USA L1, L2 Visa
1

Hi,

In case someone has mehndi on fingertips, will it cause any issue during the biometric scan?

Is it allowed to go for the scan with mehndi on fingertips? or the scan is not allowed at all?

If the scan is allowed, can it cause any issues at port of entry?

2

With current technology at use in Consulate , Mehandi is no problem

3

My Sister’s UK Visa was delayed due to Mehendi.