Speckles covering my camera's sensor

I discovered there were speckles on my image. At first I thought it was because my lens was dirty, but when I took some test shots with two other of my lenses the same speckles were still there (same size and same location).

I concluded that it was a sensor issue (canon 60D) and used a blower to try clearing them out. But they persisted.

This is an example,

https://www.dropbox.com/s/o7nmao8akmpjnc8/IMG_0055.JPG?dl=0

I don't know how they got into the sensor, considering that I rarely expose it to the air without a lens mounted in front of it, and am really annoyed.

If anyone knows, besides sending my camera away to a professional is there anything else I can do to deal with the problem?

Thank you.
 
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