Explain the difference between exercise and adequate hydration

Well, quite literally the answer is already in the question. Exercise is the exertion of oneself to build and work up our physical ability. Adequate hydration is just making sure that you are drinking enough water, no matter in exercise or in your daily lives. 

Exercise is activity requiring physical effort, carried out especially to sustain or improve health and fitness.
Hydration is the addition of water to a chemical molecule without hydrolysis. The process of providing an adequate amount of liquid to bodily tissues.
Hope this helps! :)

There are a couple of answers.you could have an infection, a sti, std, or other problematic health issues.i would recommend going to the doctors, if not, take a shower and wash down there, then wait a couple of days, and if it’s still there, then is when you should go to the nearest or trusted gynecologist of your choice.