Looks more like a stain from what I can see. On a Cud the area affected will be raised and show no devices on that area. Also note the reverse (opposite side) you will a a weakness opposite that area. (note on the image on the reverse side at 7-8:00) On your coin I'm seeing the devices, the rims and the appearance of discoloring.
I agree. It looks like Krazy Glue to me. I'd bet that the splotches of remaining mint luster (e.g. by the T in CENT) are where prior glue was but then fell off of your coin.
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