I have prints located on the palms of my hands.?

So, I have been wondering for years what the prints on my palms mean. I have been to two palm readers who say that they have never seen this type of thing before. Basically it looks like this: Imagine a fingerprint placed below the thumb on the meaty part of your palm. Does anyone have any idea what this signifies when it comes to palm reading? They are slightly raised and as clear as day. I am pretty sure this means I was trying to grow two extra fingers in the womb, but let us think of this from a nonsensical point of view...palm reading. Thanks!