Toenails can get discolored due to some kinds of medication. It contains chemicals like formalin, dimethylurea, or glyoxal that penetrate and stain the layers of keratin in your nail. Nail polish is one of the biggest culprits in regards to toenail discoloration. For example, psoriasis can manifest yellow-brown spots under the nail, cirrhosis can cause severe whiteness of nails, yellow can signal diabetes, etc. Nail discoloration can occur as a result of an underlying health condition. Tight-fitting shoes can stop blood circulation to the toes resulting in discoloration. Trauma to the nail like stubbing the foot or dropping heavy objects on it can cause a subungual hematoma which leads to a red or purple discoloration. Some common causes of nail fungus are sweaty and damp feet, walking barefoot, cuts or scraps near the nail, and improper foot hygiene. If left untreated, the infection will spread, and the discolored area will get larger. Toe nail fungus can make your toe nails become yellow, reddish brown, green, or black. Causes of toenail discoloration Nail fungus or onychomycosis The discoloration can appear yellow, green, blue, purple, or black. These range from minor injuries to potentially serious health conditions. Toenail discoloration is also known as chromonychia and can have many causes. Often, one of the first symptoms of an underlying illness is discolored nails. Healthy toenails have a clear and partially translucent color which is an indication of a healthy body.
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