After foreplay with my boyfriend my labia becomes swollen and a dark pink ish colour. It hurts to touch and its uncomfortable it is also quite soft but can be rigid at times. It doesn't hurt while we are engaging in foreplay but after about 20 minutes of stopping it becomes noticeable. After a couple of hours this fades until we next have this happen. It sometimes stings to urinate when its this way too. Its come up over the past two months and it has being causing me to get uncomfortable when it happens.

Like I say, after a few hours it subsides but its bugging me. Does anybody have any clues to help me figure out what this is and how to prevent/ stop this happening?

Thank you!