What is it on phal. Cassandra leaves

I have these sunken spots on the underside of phal Cassandra leaves. They are colorless and don't change or spread. I have been monitoring it for over a month. They affect only two older leaves and are not visible from the top. What can it be and how bad is it?

Thanks a lot.

[Cym Ladye]

The second photo shows a normal spotting on certain types of phal hybrid breeding. Not to worry as it actually looks quite healthy.

I have no idea about the markings shown in the first photo, but if it isn't spreading, it may be mechanical damage of some sort.

[zxyqu]

Agreed with Cym lady. If it isn't spreading, mechanical/insect/etc are possible, but has probably subsided. I'd keep monitoring it, but wouldn't worry too much, as it looks very healthy (new leaf and good roots).

[lepetitmartien]

I'd vote mechanical issue too, eventually a bit of localized cold or an insect very partial at his dinner… As long as it's not evolving/spreading, you're safe don't worry. And it looks a fit chap your phal.

Thank you evrybody. I feel better now. Maybe it was some kind of pest munching on my leaves before plant got here. I will continue monitoring. I was just worried that it could be some type of virus where there is nothing you can do to cure it.