How can i catch rid of this huge, chubby, rough cankersore on the inside of my bottom lip within my mouth?

Rinse with hydrogen peroxide - don't swallow. We will use a swab to mop a small canker sore with hydrogen peroxide.
You can also rinse near a 10 drop to 6 oz water dilution of solution GSE.
Cut back on sharp food - usually a cause of canker sores. (no tomato products, red juice, etc.) That will relief it clear faster.
Try to gargle with brackish water or mop iodized salt right on the sore..it will burn a bit...but comfort to dry it up faster...try to avoid food and drinks high contained by acid (orange liquid esp) that should help it treat up faster!