Yikes! The Black Spot! Another Oncidium

[Highland Fashionista]

Hi all. Here I am again with another oncidium question. I got this Oncidium from Ebay today. When I unwrapped it, I was met with one less than fabulous looking pseudobulb (old, there is an old spike on the plant)...but alarmingly there it seems to have The Black Spot. The bulb itself is not particularly mushy, and even the spot itself is not too mushy...just a wee bit but it doesn't feel all that bad.

What is it (this spot) and what do I do with it? The rest of the plant doesn't look all that bad. Roots are nice and turgid. There is some new growth along the side.

I am planning on growing it in SH...(waiting for my proper SH pots to come from Rays from the US) so I soaked it in super thrive and put it in this jar for the quarantine period. Put some cinnamon paste on The Black Spot. should I worry?