Bumps on Ficus Nitida

I have something that looks like corky bumps on our ficus nitida. They seem to follow the vein on the leaf. On closer inspection, I now see that there is a little black 'item' within some of the corky growths. Its very small about an eight of an inch, black.
I know what Thrips look like on this Ficus, and have dealt with those via a systemic...but these bumps don't seem to be affected...and they are spreading.
I have spent a lot of time trying to find something on the net, but to no avail...can anyone help me?
Thanks for your help!
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