 [ Symptoms ] after giving my wife oral sex regularly i developed a thrush rash in my mouth what could cause this [ Disease ] hi may be you wife has thrush i would send her off for tests if not she could try the sea salt way just a couple of handfuls of sea salt in a warm bath or a sitz bath but less sea salt for a week but she needs to let the water get inside her vagina and do it twice a day do hope this helps good luck