Hi welcome to Health care magic forum. From the description you are giving if the scar is on the ala of the nose we can consider it could be epistxis means nasal bleeding
to the out side of the nose. if the scar is some where else it difficult to say the cause.
any how it is always necessory to consult a doctor regarding such doutful issues.
is the bleeding into the nose from inside of the ala of nose. as the scar is nearer to the blood vessel and the scar is vulnerable it would have come out of it.
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I hope you are satisfied with my explanation, thanks for calling.