Noticed a toenail turning dark red, purple, or black? Most of the time a black toenail is simply a bruise under the nail — but because a small number are a warning sign of something serious, it is worth knowing which is which. At Family Foot & Leg Center our board-certified podiatric surgeons evaluate discolored toenails, relieve painful ones, and rule out the dangerous look-alikes at 9 Southwest Florida locations with same-day appointments available. Call (239) 430-3668 or book online now.
The most common cause is a subungual hematoma — bleeding trapped between the nail and the nail bed. This happens after a single hard injury, like dropping something on the toe or stubbing it, or from repetitive micro-trauma when the toe repeatedly jams into the front of a shoe. Runners, pickleball and tennis players, hikers, and anyone in shoes that are a touch too short develop this so often it has a nickname: runner’s toe. Less commonly, a dark toenail reflects a fungal infection that darkens the debris under the nail, and rarely it can be a subungual melanoma — a skin cancer that starts beneath the nail. Telling these apart is exactly what a podiatric exam is for.
An acute bruise under the nail often throbs and feels tight from pressure, especially in the first day or two after an injury. Discoloration ranges from red to purple to brown to black depending on how old the blood is. Over the following weeks the dark area typically grows outward with the nail, and the nail may loosen or eventually shed. Pain that is severe, or a nail that is lifting and catching, is worth having addressed.
Our active, year-round outdoor culture drives a lot of toenail trauma: pickleball’s quick stops, tennis, running on pavement and sand, long hikes, and golf all send the toes repeatedly into the shoe. Open sandals and flip-flops leave toes exposed to stubbing on tile and pool decks. In a region with a large retiree population, it is also common to see fungal discoloration overlap with old trauma — which is another reason a professional look matters.
If you have diabetes, peripheral neuropathy, or poor circulation, do not treat a black toenail at home. Reduced sensation can hide a painful sore, and reduced blood flow means a small injury or trapped blood under the nail can become an infection or ulceration before you notice it. Any nail color change in these patients should be evaluated by a podiatrist promptly — this is where early, professional care prevents a minor problem from becoming a limb-threatening one.
We start with a focused history — was there an injury, is more than one nail involved, how long has it been there? — and examine the nail closely, often with dermoscopy. When there was significant trauma we obtain an on-site digital X-ray to rule out a fracture of the bone beneath the nail. If features suggest melanoma rather than a bruise (no injury, a single widening dark band, pigment spreading onto the skin, or a spot that will not grow out), we perform or arrange a nail bed biopsy. When in doubt, we biopsy — because catching a subungual melanoma early is what makes it treatable.
For a fresh, painful bruise under the nail, we can relieve the pressure with a quick, sterile in-office procedure called trephination — creating a tiny opening to drain the trapped blood, which usually brings immediate relief. If the nail is loose or catching, we trim and dress it to protect the nail bed while it heals. When a fungal infection is contributing, we confirm it and treat with topical or oral antifungal therapy, and can discuss laser nail treatment. If the skin under the nail is broken or ulcerated, we treat it as a wound to prevent infection — especially important in diabetic patients, where our advanced wound care comes in. And whenever a lesion looks suspicious, biopsy takes priority over cosmetics. Prevention is straightforward: properly fitted shoes with room in the toe box, and calf stretching, since tight calves increase the force the toes drive into the shoe.
Family Foot & Leg Center has served Southwest Florida since 2005 under the clinical direction of Dr. Kevin Lam, DPM, FACFAS, DABLES, DABPS — named among America’s Top Podiatrists and trained at Temple University, Mount Sinai Medical Center, and Jackson Memorial Health. With on-site digital X-ray, in-office procedures, laser nail treatment, advanced wound care, and 9 offices from Marco Island to Sarasota, you get an answer and a plan the same day — not a wait-and-see.
Most are a harmless bruise that grows out. The exception is a dark spot that appears without injury, involves one nail, widens, or spreads pigment onto the skin — that can signal melanoma and needs prompt evaluation. Anyone with diabetes or poor circulation should have any nail color change checked.
Usually bleeding under the nail from a single stub or repeated pressure in shoes (runner’s toe). Fungal infection and, rarely, melanoma are other causes.
Often yes — trapped blood can lift the nail, which may shed over weeks to months. A new nail usually grows back, sometimes thicker if the root was injured.
Worry if there was no injury, only one nail is affected, a dark band is widening, pigment spreads onto the skin (Hutchinson’s sign), or it will not grow out. These warrant prompt evaluation and sometimes a biopsy.
Any of our 9 offices — Naples, Estero, Fort Myers, Cape Coral, Port Charlotte, and Sarasota — with same-day or next-day appointments usually available.
Not sure if your black toenail is a bruise or something more? Get a definitive answer. Call (239) 430-3668 or book your appointment online 24/7.
Family Foot and Leg Center, PA — Podiatrist Naples FL | Foot Surgery | Heel Pain | Bunion Treatment | Diabetic Foot Care | Sports Podiatry | Serving Marco Island, Naples, Bonita Springs, Fort Myers, Cape Coral, Port Charlotte & Sarasota.
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