http://www.sightings.com/Archives/alienabductkelownaBC2003_2.html
“About 11 months ago, my 18 year old son came to visit me for a few days from the lower mainland. A couple of days into the visit, he woke up in the morning and went to have his morning shower. As he was walking into the bathroom (wearing only shorts), I noticed to my horror that he had a perfect 4"x4"x4" triangular mark on his back, and inside this triangle were all these perfectly round red marks about the size of a pencil eraser. He said that he felt no pain, but that it was kind of itchy-burning feeling.
We went to the walk in clinic to have a doctor look at it, but the doctor did not have any idea what this could be, or what may have caused it. She had never seen anything like it before. It disappeared about 4 days later.“
My estimate is this occurred in 2002-03.
Found by Jordon, a report on sightings.com by Brian Vike.