Serious Eats: Talk

Yerba mate drinkers- question!

So I have a newish mate gourd, I "cured" it as recommended by filling it up with mate and pouring boiling water in and letting it stand for a few hours. Been using it for a couple weeks - notice a few black mold spots. The other day, after use, let it dry (with paper towel inside to absorb moisture), and there are black spots all over! Some mate website said this is normal and not harmful, but man that freaks me out.

Is that actually normal? What can I do about this?

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