if i were you i would see a medical doctor. what you are describing as a black dot could be someting serious. i know you said you went to a dermatologist. did she test the spot or make sure it was only a scar issue? if it is getting larger and if you are picking at it, the spot maybe something more than a scar. you could go to a surgeon and have it biopsied. i don't fool around with anything that lasts a year.