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Published on: 8/20/2026

What could a dark spot on my nail after acrylics indicate?

A dark spot under your nail after acrylics may be a sign of Green Nail Syndrome (chloronychia), a bacterial infection caused by Pseudomonas aeruginosa. This bacteria thrives in moist, enclosed spaces—like the gap that can form between an acrylic and your natural nail—leading to a green, black, or dark blue discoloration.

Because nail discoloration can also point to other conditions such as fungal infections, trauma, or, in rare cases, melanoma, it's important not to guess. Take a free, instant, online symptom check to better understand your symptoms and confidently plan your next steps.

Reviewed for medical accuracy: 07/15/2026

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Explanation

A dark spot on your nail after using acrylics could be a sign of Green Nail Syndrome. This condition is caused by a bacterial infection, often linked to moisture getting trapped between the acrylic and the natural nail. The bacteria, usually Pseudomonas, can cause a greenish or dark discoloration on the nail.

What to Do:

  • Remove Acrylics: Carefully remove the acrylic nails to allow the natural nail to breathe.
  • Keep Nails Dry: Make sure to keep your nails dry and clean to prevent further bacterial growth.
  • Consult a Doctor: If the discoloration persists or worsens, use this free symptom checker to help identify what might be causing your symptoms and determine if you need to see a healthcare provider.

Prevention Tips:

  • Ensure Proper Application: Make sure acrylics are applied correctly to avoid moisture trapping.
  • Regular Cleaning: Clean your nails regularly and thoroughly to prevent infections.

Remember, getting help from a professional can ensure the right treatment and care for your nails.

(References)

  • Carhart P, Espinosa J, & Lucerna A. (2024). A Case of Green Nail Syndrome Diagnosed in the .... Cureus, 38681312.

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