Pruritus vulvae can happen anytime. There is a way to prevent or relieve it by wearing anti bacterial underpant.
And the most effective fabric for making this underwear is seaweed cotton fabric. Seaweed fiber is tested to be microbial resistant and worked as medical dressing. Below is the testing report of seaweed fiber in resisting escherichia coli, staphylococcus aureus, candida albicans. The inhibitory rate is 99%.
Besides, the kelp fabric will also moisturing the skin and releasing mineral substance to protect the private part. But it only works for mild symptons. For serious symptons, please go to see a doctor to get some medicines to cure it.