hello dear
thanks for your query at HCM
injection site reaction are more common with
bcg vaccination usually bcg vaccination site heals with scar formation after 6 to 12 weeks
some times child may have prolonged ulceration , supppurative
lymphadenitis, at the site of the injection
if there is local abcess and pus discharge from the site it should be aspirated it will clear spontaneously after that
if not cleared after aspiration it should be incised and treated with
isoniazid powder for local application.
get your child examined by
pediatrician and determine wheather it is a ulcer , abcess, or pus and take treatment accordingly as mentioned above
hope this information will help you
regards