The inner part of my vagina lips are turning a dark color. i also have a small black bump on my left inner vagina lip. there is irritating and pain.

Pelvic exam: See aGYN for evaluation - you may have vaginal congestion or a Bartholin's cyst- get examined. Cannot be answered online.

Infection?: The symptoms you describe could be from an infected cyst, although it is difficult to tell without actually seeing it. It would be best for you to see a doctor to have it evaluated. If it is an infected cyst or abscess, it may need to be drained. Best wishes.

See your GYN: May be bruising but see your Gyn for a definitive diagnosis.

See a Doctor: When you see some growth or bump in your vagina or lips of the vagina, it is safest to see your doctor. Good Luck!

Hyperpigmentation: The most common and likely cause of any darkening of the labia is typically changes in your hormones.This is very normal and nothing to worry about. The small black bump is a bit harder to diagnose over the internet and can be one of many things.I would recommend you have your doctor take a look at it to determine what exactly it is.You also want to rule out an infection if it's painful/irritated