Blue color on fiddle leaf fig

Hi, I'm new to trying to grow non-succulents, and got this fiddle leaf fig last October (online, from Costa). It had this blue color on some of the leaves when I got it, which doesn't seem to wipe off. It looks more white in photos, but in person it definitely has a blue cast to it. The lower leaves came kind of damaged and it lost a couple soon after arrival, but otherwise has been doing pretty well. There have been several new leaves that all look good and don't have the blue stuff on them.

I just got a grow light, which has made the blue stuff even more obvious (was kind of trying to ignoring it before to be honest), and I can even see a little on the trunk (stem?) Just starting to worry that maybe it's some kind of infestation. The only actual bugs I've seen have been gnats in the soil, which I think I've finally gotten rid of.

Someone please tell me it's nothing or that I have to burn down my house. Thank you.