Dear Poorly, Welcome to Healthcaremagic!
STDs [sexually transmitted diseases] are causes by infections. They doNOT present as dryness of inner thighs. So there should be some other cause. Please reduce soap use. Start applying coconut or olive oil in that area. You may also show to a good dermatologist
in your city.
Wishing you best of health
Dr NAVEEN KANSAL, MD [PGI, Chd]
Skin Clinic, SCO 298, Sect. 20, Panchkula.