So I woke up one day some time ago with this symmetrical red grid like pattern on both my butt cheeks. It didn't hurt nor was it itchy, and I had no idea how I got it. And if you're wondering how I found out, no I don't wear pants when I'm home. Like any rational millennial, I googled 'red grid like patterns' and came across this website. Like you are, I was shocked (and amazed) to find out the same exact pattern had been experienced by multiple people worldwide, even dating back to the '60s. Curious to find out more, I emailed the author of the website who sent me a long email asking me to fill out a questionnaire detailing the mark so we could figure out if it was from the same phenomenon. I got cold feet at that point, so nothing ever came of that and the mark eventually faded. And that was how I was marked by an alien. The end.