Based on your history and the photographs, I do not notice any obvious suspicious lesion. The swelling appears consistent with a healing traumatic tongue bite. It is common for the pain to improve first, while the swelling may take 1–2 weeks to completely subside.
Next Steps
In the meantime:
* Rinse with warm salt water 3–4 times daily.
* Avoid spicy, hot, and sharp foods.
* Try not to bite the area again while chewing.
* Maintain good oral hygiene
Health Tips
If the swelling persists beyond 2 weeks, increases in size, becomes very painful, develops pus, or you notice difficulty swallowing or speaking, please visit an oral medicine specialist or dentist for a clinical examination.
At present, from the history and the photos provided, it does not appear suspicious, so there is no need to panic. Continue to observe it for a few more days, and it should gradually resolve.