It could be a yeast infection or Bacterial vaginosis. Both of which can be treated very easily :). It could also be your body wash that has led to this irritation, try using body washes that are designed to go on such a delicate area.
Yes u can do sex with ur husband but don't forget to do sex without condom otherwise your husband is also infected the same infection
Hi there and welcome. Do you also have a discharge? Could you have a yeast infection??