My name is Saige and I am 14! I am the moderator of this youth forum. I actually have a birthmark below my lower lip and on both sides of my neck. I find that a GREAT waterproof concealer which works for me is called Coverblend. The company sells it in all different sizes of tubes...so maybe you could buy one of the smaller one's to just try it out (each tube lasts me a long time and I wear it everyday!) I hope that this product will help you as it has helped me everyday!!!If you end up trying it let me know the results! Also, I'm sorry the site is giving you trouble with your password, I hope everything works out! Good Luck!