I accidentally cut off a mole, is it dangerous? can i develop melanoma or something bad?

be very careful with it make sure that is doesn't get infected or anything take really good care of it. It may or may not grow back but if it does pay attention to the shape and color of it. If your mole is circular or oval that's fine it might be okay if it's another shape mainly the color is what you need to worry about if it is different colors then brown/tan or in that general color area you should be okay yellow is not good nor any other color if it comes back red that should be okay it should change back to its original color if not you will have to go see a doctor to get it removed and stitched up professionally