Also, a disease that causes chronic leg swelling and diabetes can cause yellow toe nails so you may want to see a doctor to double check your blood sugar and see if it is toe nail fungus. If you paint your toenails with yellow nail polish it can stain your nails too.
mkh9
This is caused by toenail fungus. These are fungi (called (dermatophytes) that are in the environment and infect the nails, hair and skin. The toenails get infected by walking in a gym barefoot, or wearing someone elses shoes, having moist feet and then getting in a shower where someone else had athletes foot. Breaking a toenail will make you more susceptible if you never were before. Since you already have these toenails infected you can take a drug called Lamisil (there is generic pill too). This will kill the fungal part of the nail and the other part just grows out. It takes months until the nail finally grows out. There is laser treatment but it costs a lot and insurance doesn't cover it. You can protect your self by walking in the gym or showers wearing clean or new flip flops but these fungi are everywhere. Wearing sandals keeps your feet dry and less likely to get them but it is bad for you back. Wearing sock is good to prevent getting exposed to them but it keeps your feet wet. So it is a toss up. Hope this helps.
mkh9
um thats from wearing jump shoes and being barefeet