ridges become unusually deep, uneven, or appear alongside other nail changes, they may be connected to nutritional issues such as low iron or vitamin B12 levels. Paying attention to changes over time can help identify when something is different from your normal nail pattern.
Dark streaks appearing under the nails should be taken more seriously, especially if they develop suddenly or change in size, color, or shape. In some cases, these streaks can be associated with melanoma, a type of skin cancer that requires prompt medical evaluation. Not every dark
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