What is the reason for many black spots on underwear and underpants?

Patient's question:

No

Doctor's answer:

It is recommended that you go to the hospital for a specialized examination to determine the nature of the discharge. Generally, black discharge indicates a small amount of vaginal bleeding. However, since I cannot perform a check, I can only make an approximate judgment. It could also be a symptom of vaginitis. After a clear examination, you can determine whether treatment is needed.