It’s difficult to say anything with this blue line in the middle. Could be anything.
Hi Jane, its hard to say with the obstructed picture but I sometimes get minor yeast infections during my period which causes my inner labia and vulva to get a bit rosey and inflamed. If it persists after your period take another picture or see the Doctor. I hope this helps.
It could just be some irritation. See if it goes away within a week. If not, you might want to see a doctor.