I offer some easy, natural solutions to help improve your situation. With all videos on YouTube, take them with a grain of salt and go to your local dermatologist or doctor for issues that persist.
To improve dry skin you'll want to switch from a harsh soap/wash to a more skin friendly soap like a castile soap or natural soap. From there use beard oil to help condition and moisturize the skin.
With fungal infections you'll need a type of shampoo or cream that will help kill the fungus, but a natural deterrent is good ole fashion sunlight.
With poor health, simply exercise, eat right, and lower stress - boom!