Don't worry...you are suffering from nail fungus causing this nail black patches... Specific medicine available for good control... Treatment depends on the severity..Do direct online consultation for detailed prescription by sending photos.
This looks like infected nail , infection could be bacterial with anaerobic type u can expect more smell, however u can have super added fungal infection .
It's better u do a test for confirmation of diagnosis.
Next Steps
gram staining and pus culture for bacteria and fungus
After getting salon nails done my 2 fingernails have yellowed and developed green patches, I have also ha
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