Thanks for the query.
increases physiologically during the time of intercourse, during ovulation and in the peri menstrual phase.
So no need to worry about it. But as you mentioned about bad smell, better to get examined once to rule out any possibility of infection.
You can use cream containing alovera and vit E, that will help in decreasing the blacking discoloration.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429