What causes these?

Another Update and…. the causes of blue orbs dust, raindrops, flash , as explored and documented on the following site or could it be ???????
http://www.hauntedessex.com/orbs.htm

This is the GENUINE blue orb shown above up close. Note the size of the object, the density of the object is similar to an electron. The focus is clear and there are color variations and distinct detail. Orbs also are seen in Yellow, Red and White and other colours. Sometimes they have what looks like a face in them.

These appeared (and there are more of them) on a photograph, digital, the photos taken seconds before and after did not have any showing – can anyone give me a clue? I am not into photography so maybe it is something happens on occasion- just curious Thanks Loraine

BLUE ORBS?????

UPDATE: Mark Teleha magnified the smaller two for me
BLUE ORBS