What could cause black lines to appear on my nails after acrylics?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Black lines on nails after using acrylics are commonly caused by nail bed damage, trauma from removal, or allergic reactions to chemicals like methacrylates found in acrylic products. These lines may appear as splinter hemorrhages (tiny broken blood vessels) or pigmentation changes, and while often harmless, they can sometimes signal an underlying issue such as infection, melanonychia, or in rare cases, melanoma.

Because black lines on nails can range from cosmetic damage to a warning sign of something more serious, it's important not to guess. Take a free, instant, online symptom check to better understand what may be causing your nail changes and get personalized guidance on your next steps.

Reviewed for medical accuracy: 07/15/2026

Quick answers

Frequently Asked Questions

4 answers

The most common questions people search after this page

Concerned about your symptoms?

Start a symptom check

Explanation

When you notice black lines on your nails after using acrylics, it could be due to damage or reactions caused by the chemicals in the acrylic products.

Possible Causes:

Chemical Reaction: Acrylics contain chemicals that can cause changes in the nail, such as methyl methacrylate, which might lead to nail discoloration or damage.
Nail Damage: The process of applying and removing acrylics can weaken or damage the nail, leading to changes like black lines.

What to Do:

Observe: Keep an eye on the nails to see if the lines change or go away.
Consult a Professional: If the lines persist or worsen, you can check your symptoms with our free AI symptom checker to help determine whether you should see a healthcare provider.

It's important to ensure that any nail products used are applied by a professional and that you follow all recommended aftercare steps to minimize potential problems.

(References)

Adigun CG, & Shoaf H. (2020). Psoriasiform Onychodystrophy Induced by Photobonded .... The Journal of Clinical and Aesthetic Dermatology, 7819586.
Borak J, Fields C, Andrews LS, & Pemberton MA. (2011). Methyl methacrylate and respiratory sensitization: A Critical .... Critical Reviews in Toxicology, 3072694.
Manchanda Y, Rathi SK, Joshi A, & Das S. (2023). Oral Lichen Planus: An Updated Review .... Indian Dermatology Online Journal, 10810384.

Tell your friends about us.

We would love to help them too.

For First Time Users

What is Ubie’s Doctor’s Note?

We provide a database of explanations from real doctors on a range of medical topics. Get started by exploring our library of questions and topics you want to learn more about.

Was this page helpful?

Purpose and positioning of servicesUbie Doctor's Note is a service for informational purposes. The provision of information by physicians, medical professionals, etc. is not a medical treatment. If medical treatment is required, please consult your doctor or medical institution. We strive to provide reliable and accurate information, but we do not guarantee the completeness of the content. If you find any errors in the information, please contact us.