Other causes of toenail discoloration include ingrown nails, skin cancer, certain inflammatory conditions, and Darier disease. Psoriasis can sometimes mimic a fungal infection of the nail even though psoriasis isn’t an infection at all but rather a skin disorder caused by an overactive immune system. It’s possible, especially if you don’t look at your toes on a regular basis, that toe discoloration is caused by physical trauma that the person has forgotten about or was unaware of. Keep in mind, too, that the toes are an extremity that may not be as sensitive to pain as other parts of the body. Physical trauma that doesn’t cause the blood vessels to break may result in white lines or streaks. The dark discoloration can also be a secondary effect of fungal infection in which a misshapen toenail creates a space to harbor dirt and debris and spread the fungal infection to the entire toe.ĭark discoloration can also be a sign of physical trauma to the toe, either as a bruise or as dried blood that’s trapped under the nail. Again, it’s common for doctors to order lab testing. Knowing the cause of your infection helps determine the best course of treatment. Chloronychia, or green-nail syndrome, is one notable example with these bacteria thriving in damp or wet conditions. Other microorganisms including bacteria can infect the nails. What else causes toenail discoloration? Back to top There are about 60 different kinds of Candida fungal species. Though less common in the nails, this is the most common type of fungal infection overall when you also account for infections that affect the mucus membranes and the GI tract.
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