In reply to Natalie McMillan.

It's possible that it isn't a freckle but flat mole. My son was born with a dark brown speck that looked like a freckle inside his thigh crease. It gradually got a little bigger over the next year of his life and then slowed down. It began growing again when he was eight and we had a dermatology clinic look at it. It was a mole and they removed it so that it wouldn't end up getting irritated for causing problems when he got older.