My son has a big wart on the corner of his eye, and he is very conscious of it. Any natural suggestions? Thanks.

The best "natural suggestion" is to wait it out. Warts are a virus and will disappear with time. Otherwise you can take him to the doctor to have it removed.

I had a wart many years ago and read a story (maybe by Stephen Jay Gould?) about the power of suggestion, and he cited a large study of warts done at a large hospital. The placebo group did just as well as the group treated with a known wart remover. It was theorized that when someone puts a topical treatment on a wart, they stop touching it. So it might have been that as much as the power of suggestion.
So I stopped playing with my wart (on a finger) and it went away in under 10 days. It had been there for almost a year. Coincidence? Maybe, maybe not.
You could try either one - put water with a drop of steeped tea in a bottle and apply with a swab, or tell him not to touch it. Or both.