Should I be Concerned...?

[nikkubus]

I promise you the mites did not come from your christmas tree. 99.9% they came from store.

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That was my first thought too, but it's certainly possible in some locations. They can live a pretty decent amount of time with no host and in more tropical climates like FL or similar I could certainly see wild reptiles being active this time of year. Still like 90% it's the store but I wouldn't swear on it.