Suggest Remedy For Stretch Marks In The Groin Area Post Child Birth

I had my youngest son January of 2013. Every since the pregnancy I ve had stretch marks all over my groin, obviously after delivery those stretch marks became loose and wrinkly looking, but have always remained there since. However two nights ago i got out of the shower and bam! One of the wrinkles had become swollen but same color as my skin, same texture as my skin. Over night out goes back down but every day it swells back up. I have been faithful, it is not an std, i don t want my boyfriend freaking out, but what s the deal? Ooh and i have been battling a cold for the past two weeks.