Medically reviewed by Susan Bard, MD Key Takeaways A black line on a nail could be melanonychia or a splinter ...

Your nails serve as more than just a canvas for your favorite polish color. These small but significant parts of your body can reveal important information about your overall health, often acting as ...

—A new study from Weill Cornell Medicine found that patients with isolated nail psoriasis had nail findings for almost 3 years before they were diagnosed with psoriatic arthritis. It may be possible ...