Tim took a shower after Bible study and called me into the bathroom to see this.
He said this ring shows up only when he's taking a shower, appears within a few minutes and lasts around 10-15 minutes. He doesn't remember when it started, but knows it's been at least a couple months. It doesn't itch, isn't raised, and there are no other symptoms. Despite the fact it looks like he just pressed on the lid of a bottle, he hadn't touched anything. Plus, you'll notice it's his right hand and he's a leftie. He said it always appears in the same area, though not always the exact same spot. Sometimes it's closer to the base of his thumb, other times closer to the bend between his thumb and pointer finger. He hasn't noticed rings in any other places and it doesn't show up while washing his hands or doing dishes.
Is that bizarre or what? Anyone have a clue as to what it could be? I'm leaning toward "bodies are weird", so Beep and I have had fun Skyping tonight about all the possibilities and ramifications. Sarcastic style, of course, cause that's how our family is.
Anyway, we're not worried. Just curious. So, if you have clue, then feel free to enlighted us!
UPDATE - The mystery has been solved. My original suspicion that he was pressing something was correct, but he didn't even realize he did it. I win.
It's true that there are no bottles in our shower that would make that shape. However, he realized today, as he paid extra close attention, that he rests his hand on the faucet and dangles his fingers under the water while waiting for it to warm up. The circle is the shape of the plug thing that you pull up for a bath, which is on top of the faucet. I don't ever rest my hand there and it never occured to me that could be an option.
Anyway, that's that. No alien invasion, CIA microchip implants, or contagious diseases. Just a guy who doesn't pay attention to what he does.