Wife and daughter both developed severe yeast infections while on vacation. What could be joint cause?

My wife and daughter have both developed very severe yeast infections while we were on vacation last week. We traveled to Carlsbad Caverns and I am thinking the damp caves may have given it to them. They are unsure. Regardless, they both seem pretty foul at the moment. Me and my wife are both 61 and our daughter is 32. As adults, we do not feel a need for shame in medical emergencies. I simply asked my daughter if she would mind my checking out the situation and she politely said she did not. I can attest that they both have the same yeast infection. I am 90% sure. The look and smell is very similar and both are very infected. They both have very inflamed labias are difficulty while urinating. Does my home-medicine assessment sound correct to you doctor types or should they see a professional? We do not have much money and no health insurance.