Unrelated: Your low back pain and swollen labia are probably unrelated. The labia swell with very little trauma or as a reaction to a lot of chemicals ( allergic type reaction) and the sex last night could have bruised the labia. The low back ache is probably due to something else entirely like muscle strain, a bladder infection, or even a pelvic infection especially since it started a few days earlier.
Answered 7/1/2015
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