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use tweezers, its time consuming, but waxing will take off all the hair on your chin and more will come.
Sounds like your bunny has an abcess under it's chin. Not good. Take your bunny to a vet.
chinny chin chin
That would be a "cleft". The terms cleft chin, butt chin, chin cleft,, superhero chin, dimple chin, or a chin dimple refer to a dimple on the chin
If you are going to grow your hair from the chin to your shoulder then i would say that it will take about 2 years at the most, but you must trim the ends so they don't split.