Hello and welcome to the forum. Sorry about your concern but glad you asked. This is a mole you've had for a long time and it hasn't changed, which is a good sign. True that most moles are round or oval but the main thing that doctors look for in terms of shape is symmetry. Sounds like this would not be of concern to them in regards to this feature. I would have your doctor look at it at your very next physical to confirm. And if it DOES change sizes, see a dermatologist. https://www.mayoclinic.org/diseases-conditions/moles/symptoms-causes/syc-20375200