hello and welcome,
the black/blue mark may be due to dental carries.visit your dentist
and get it checked.the carries can be excavated and filled with vitapex-gic or any other tooth coloured material.
as the tooth is erupted recently,gums look ugly as the adjacent teeth are yet to erupt,which is known as ugly duckling stage.the gums looks regular and proper tooth alignment occurs only after eruption all anterior teeth.
maintenance is very important.poor oral hygiene will result in plaque
and food debris accumulation.this results in gingivitis
.get the scaling done by your dentist.
use soft-bristled toothbrush to clean your teeth twice daily.wash your mouth after every meals .
always brush your teeth from up to down in upper arch and down to up in lower arch.
use chlorhaxidine containing mouthwash to prevent plaque accumulation.