I have a bump on the inside of my cheek thats a bit swollen and a bit discoloured brown/green and red otherwise. it doesn't hurt - what is it?

Picture of lesion: Visualization of lesion and medical history and physical exam required for diagnosis. Any possibility of inadvertently having bitten your cheek?

Possible duct: It could be an opening of a salivary gland duct that enters your mouth. Have your physician or an otolaryngologist examine it if the swelling persists.

Listen : it could be trauma, infection, benign or worrisome growth. I would suggest a doctor takes a look....maybe a sample (biopsy) of not resolving soon.