An iridologist will tell you this indicates a problem with your kidneys, or
some similar nonsense.

You can find more reliable information by googling these terms:

Iris freckle
Iris nevus
Melanoma (which it probably isn't.)

-MT

First off, the pic in your link is of your left eye only; at least I
can't view any right eye on that link.

Any dark spot on the iris that is new must be investigated to rule out
melanoma, a potentially fatal disease.  If it's old (no change in it for
several years), then it is just a benign patch of pigment and has no
relationship to any other part of your body.  Iridology is a false paradigm.

w.stacy, o.d.