A dark spot under your toenail after a long run, a tough hike, or a basketball season can be alarming, especially when the nail starts to loosen or lift away from the skin. While black toenails are usually painless, they often signal repeated trauma, ill-fitting shoes, or a problem brewing beneath the surface that deserves a closer look. Understanding what causes the discoloration, when to worry, and how to treat it can help you protect your nail bed, prevent infection, and get back to the activities you love.
At Sweeney Foot & Ankle Specialists, Dr. D. Sean Sweeney, DPM, FACFAS, and Dr. Christy Leahey, DPM, FACFAS, bring more than 20 years of trusted expertise to every appointment. Their team has been voted Best Podiatrist in The Woodlands by Living Magazine every year since 2012, a 14-year streak built on compassionate, patient-centered care.
What Causes a Black Toenail?
A black toenail, also called a subungual hematoma, develops when blood pools beneath the nail plate after trauma. The most common culprits include athletes repeatedly jamming their toes into the front or top of a shoe, runners on long downhill stretches, dancers, and anyone wearing footwear that is too tight or too short for prolonged periods.
Common contributing factors include:
- Repetitive impact from running, hiking, tennis, or soccer
- Shoes that are too narrow, too short, or laced incorrectly
- Sudden injury, such as a dropped object on the toe
- Tight calf muscles that increase pressure on the toes during activity
- Underlying fungal infection darkening the nail
Symptoms and Possible Complications
Most black toenails are not painful, and the nail may eventually loosen and fall off as a new nail grows in. However, a damaged nail bed can create an opening that allows fungal organisms to enter, leading to a stubborn nail infection. A small sore or ulcer may also form under the nail and become infected if left untreated.
Patients with diabetes, neuropathy, or circulation concerns should never try to manage a discolored toenail at home. Any change in toenail color warrants prompt evaluation to rule out serious complications, including melanoma in rare cases.
Treatment Options
Treatment depends on the severity of the bruising and the condition of the surrounding skin. In most cases, care includes trimming loose or detached portions of the nail and applying a topical antifungal medication to prevent secondary infection. If the skin underneath is ulcerated, a topical antibiotic ointment may be recommended.
When a fungal infection has taken hold, advanced laser treatment for fungal nails offered at Sweeney Foot & Ankle Specialists can help clear the infection and restore a healthier appearance. This service is part of our broader approach to toe and toenail problems, which also includes ingrown toenail care, plantar wart treatment, and pediatric foot care.
Prevention Tips
- Choose athletic shoes with a roomy toe box and proper length
- Replace running shoes regularly and lace them snugly at the midfoot
- Stretch tight calf muscles before and after activity
- Trim nails straight across and keep them at a moderate length
- Inspect feet daily, especially if you have diabetes
Why Choose Sweeney Foot & Ankle Specialists for Black Toenail Treatment in The Woodlands, TX?
Sweeney Foot & Ankle Specialists blends modern technology with the warm, personal attention that has earned us a loyal following across The Woodlands, Spring, and Magnolia. At our practice, you can expect prompt scheduling for urgent toenail concerns, a friendly clinical environment, and providers who take time to explain every step. Whether you are an athlete protecting your training or a parent watching over your family’s foot health, we treat every patient like a neighbor.
Schedule Your Black Toenail Evaluation Today
Do not let a discolored toenail turn into a fungal infection or a more serious problem. The expert team at Sweeney Foot & Ankle Specialists is ready to evaluate your nail, ease your concerns, and design a treatment plan that fits your life. Contact our office in The Woodlands, TX, at (281) 292-4944 or our Magnolia, TX, location at (281) 789-4956 to book your consultation.