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worry? nope
worse? probably, humidity is likely to have encouraged it to start and so will continue.
I don't know if there are any aluminium oxide inhibiting paints (try a car or marine store) you could take the mirror out and carefully paint an inhibitor and/or latex paint layer around the side edge to slow it. if it thickens around the edge it might seperate the layer and ruin the mirror completely.
if the mirror has a metal ring around it you can probably remove that or attach a sacrificial anode to it (one of those cheap light metal pencil sharpeners as they are made of magnesium attached to the ring should corrode instead of the ring). I don't know whats in your scope so hard to know, it may have started with metal clips attached to the mirror too. dismantle and see if step one no matter what.
as it stands its not a significant amount or loss of quality to be noticable .
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