Ok, despite it being a hospital, dust is everywhere. Dust can be found no matter how sterile an environment is. These definitely could be dust or moisture. However, three things stand out to me. First is how different the small dust particle is on the far left compared to the other anomalies. Second is how those anomalies all look very similar. The last thing is that the one on the far right is cut on a straight edge. I don't know what it all means, but those things stand out to me.