Hi, since there is a history of trauma to the tooth, there is formation of periapical abscess
. That is why pus is oozing out from the root apex. The pulp tissue inside the tooth and root have necrosed and since become infected resulting in pus formation. The tooth needs root canal treatment
. The infection can be treated with this treatment and the broken part can be restored by the help of a ceramic crown after the treatment. Please consult a good dentist
. All the best!