OK. I've stared at this till I'm crosseyed, and upon closer inspection I think I'm gonna recant the lint/lens idea. This is why paranormal photography is such a wonderful challenge. And just like any other item in this field, nothing is concrete. And I made the simplest mistake; jumping to a conclusion.Sorry.
Now looking closely at this I noticed a couple of things. First, the wall that the anomaly appears on. It seems to be some type of semi-reflective, highly polished surface such as granite or marble.Is that the case?
Secondly, when I first looked at the "s" anomaly it appeared to be solid, thus giving me the impression of lint. But if you really look at it, you can see the design of the granite/marble through it. It also appears to be its own light source.Therefore, in it's translucence,and with it's apparent "glow" ,It more than likely is NOT lint on the lens.
So what is it? I won't speculate again until I'm sure this time. just one more thing. Is the photo digital or film. Thanks for the challenge by the way, I love solving things.
D.