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Published on: 8/20/2026
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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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.
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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