You have not mentioned how hard id this lump. is it like bone or is it like tip of nose. I had two possibilities. first it can be a lipoma
. this is tumour of fat cells . it is not dangerous and you can get it excise . Other chance it can be a lymphnode. Very rarely it can be bony tumour. So my advice to you is that you should get a ultrasound
and that will help in knowing about diagnosis.