Sounds more like a dust blob. This is a very common issue with projectors from Epson.
Originally Posted by curiousmurf /t/1517539/what-is-this-blue-spot#post_24350269
How small is the blue spot? I have experienced dust blobs in earlier Epson 720p . A typical blob the size of an orange. A few weeks ago my heart skipped a beat when I saw one dust blob (can only be seen in very dark background and you have to look for it) on my Epson 5010...but it went away two days later. I have 800 hours on my Epson...I doubt you have a dust blob on a new projector.
Also. I experienced the dust blob straight after removing the filter to clean it so maybe some dust may have went into the machine during this period. Next time i'll have something ready to place over the opening when changing filter.