Fungal infections are another common problem that can cause black toenails to form. Typically, a fungal infection causes a white or yellowish discoloration. However, debris can build up near the infection, causing the nail to appear black.
If your toenail turns black, it's most likely a bruise under the nail, technically called a subungual hematoma. You can get it from stubbing a toe or from footwear that cram your feet into the front of the shoe.
Taking antifungal pills for two months can cure an infection under the fingernails. Usually three months of treatment cures a toenail fungal infection. Antifungal pills, however, can cause side effects.
As the fungus advances, the color may change from yellow to brown. In some cases, a really nasty nail fungus case may even turn black and start to crumble.
Fungal infections are another common problem that can cause black toenails to form. Typically, a fungal infection causes a white or yellowish discoloration. However, debris can build up near the infection, causing the nail to appear black.
Black toenails can be caused by underlying medical conditions. Apparently unrelated conditions, such as diabetes, heart disease, kidney disease, and anemia, can also cause discolored toenails. So don't ignore any discolored toenail that doesn't disappear on its own, and relatively promptly.
Black toenails will typically go away on their own, but it can take several months. The condition will diminish once new tissue grows completely under the toenail itself. There are several ways to prevent a black toenail from happening in the first place.
Terbinafine and itraconazole are the 2 medicines most commonly prescribed for fungal nail infections. These usually need to be taken once or twice a day for several months to ensure the infection has completely cleared up. If you stop taking the medication too early, the infection may return.
Your health care provider may prescribe an antifungal cream, such as efinaconazole (Jublia) and tavaborole (Kerydin). You rub this product into your infected nails after soaking. These creams may work better if you first thin the nails.
Both toenail fungus and melanoma can appear as a dark stripe on the toenail and may increase in size over time. The toenail can become split and damaged in both conditions. Toenail fungus is more likely to cause thickening of the toenail and a buildup of material underneath it.
A minor subungual hematoma usually heals over time without treatment. The trapped blood will eventually be reabsorbed, and the dark mark will disappear. This can take 2–3 months for a fingernail, and up to 9 months for a toenail.
Board-certified dermatologists say to look for these signs when checking your nails for melanoma. A dark streak. This may look like a brown or black band in the nail — often on the thumb or big toe of your dominant hand or foot. However, this dark streak can show up on any nail.
“Applying Vicks VapoRub to fungus-infected toenails can clear up the notoriously hard-to-treat condition. Michigan State University clinicians found that applying the product daily to the infected nail cleared the condition in 32 of 85 patients, though it took anywhere from 5 to 16 months…”
Vicks has a little impact on toenails. Vicks Vaporub softens and lightens toenails. This makes it look like the fungus is being treated. Vicks may have some antifungal qualities, but it is unable to penetrate the toenail well enough to cure the infection.
Best Overall
We chose the Lamisil Terbinafine Hydrochloride AntiFungal Cream as our top pick because it works to address a variety of infections, including toenail fungus. The prescription-strength cream comes highly recommended by Dr. Lipner because it can treat athlete's foot before it spreads to the toenails.
Most fungal nail infections are not serious. However, some people may experience pain or be bothered by the appearance of their nails. Fungal nail infections may cause nails to become discolored, thick, fragile, or cracked. The nail may also become separated from the nail bed.
The most common culprit for a black toenail is blood under the hard tissue. Damage to the end of the toe causes blood to leak through the nail bed and stain the keratin a dark color. This is also known as a subungual hematoma, or a bruise under the nail.
If your fungus doesn't clear up at home, you should check in with a dermatologist (a skin, hair, and nail specialist) or podiatrist (a foot doctor.) They may gently scrape under your nail to get rid of some of the fungus or send it to the lab for diagnosis. They can also prescribe stronger medicines.
The best type of vinegar to treat toenail fungus is apple cider vinegar, a very acidic and strong solution that destroys toenail fungus at the source. To take full advantage of this, mix one cup of apple cider vinegar with at least 2 cups of water – this will dilute the vinegar so that it won't burn your skin.
You'll know that the medication is working and the toenail fungus is dying when your toenail changes back to its natural color, decreases in thickness, shows healthy new growth, and you see a clear delineation between the infected part of the toenail and your new nail growth.
Subungual melanoma often starts as a brown or black streak under a toenail or fingernail. A person may mistake it for a bruise. The main symptoms of subungual melanoma include: brown or black streaks in the nail without any known injury.
Subungual melanoma presents as brown-black discolorations of the nail bed. It can present as either a streak of pigment or irregular pigmentation. The discoloration can progress to thickening, splitting, or destruction of the nail with pain and inflammation.