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Nail is the hard tissue which grows on fingers. The essence of the nail is to protect your finger which actually consists of many important neurons. Your nail will usually have a slight of pink color due to the skin beneath. This color will look clearly if your nail is healthy. But if your nail is suffering from an infection because of fungus or bacteria, the color will look dull.
Nail fungus is usually the main cause of the infection around your nail. This fungus may produce bad odor which makes your nail look unhealthy and dirty. Your nail may also become thick and cracked due to the growth of the fungus. Toenail fungus may also happen if you wrapped your feet inside the shoes for a long time, moreover if your shoes are made of non-breathable material which may cause your feet to sweat heavily. Nail fungus treatment, which is used to cure the infection, is quite varied. Your doctor may give you antifungal nail polish, topical cream, pill, or even a surgery to remove the fungus and cure the pain. The treatment will be given with the regard of your condition. If the topical cream which contains of active ozone and tea tree is working well in removing the fungus, there is no need for the doctor to ask you to consume the pill which may not be good for your liver.
So, if your nail turns to be something ugly, you should immediately visit the doctor!