My thoughts are that you are worrying absolutely unnecessarily. There is nothing in your description that suggests a sexually-transmitted disease. It sounds like chafing, not even
yeastVaginal yeast infection
Yeast and mold
Yeast infections or
fungusFungus
Pulmonary aspergilloma (mycetoma) (and those are in any case not sexually transmitted anyway most of the time.) My advice is to clean the area gently, keep it lubricated, and let the dermatologist have a look when you get the appointment. be sure to share your concerns about
STDStds and ecological niches's, because I'd bet the doctor won't even think about them unless you bring them up. Then you can relax and just do what it takes to keep the
skinActinic keratosis
Aging changes in skin
Allergy skin prick or scratch test
Allergy testing
Basal cell carcinoma
Birthmarks - red
Cellulitis
Circumcision
Cutaneous skin tags
Dry skin
Fair skin cancer risks calm.
Best.
Dr. Rockoff