Thanks for asking the query,
Wisdom tooth is the last tooth to errupt in the oral cavity often tilted, impacted and malaligned in the jaw bone.
Hard lump in the jaw can be due to due to abscess
in the tooth which is drained in the jaw bone, or can be a osseous lesion.
I would suggest you to get a thorough clinical examination , take an OPG radiograph.
Wisdom tooth does not have any significant role in mastication an occlussion, as your tooth is broken . Drainage
of abscess is required,I would suggest you to get it extracted.
Take a course of antibiotic and analgesic
Maintain a good oral hygiene
, take lukewarm saline gargles and antiseptic mouthwash rinses twice daily.
Hope this helps out.