Red or Black Spots on Nails? What They Might Mean

In some cases, such as endocarditis, it may appear as a red spot resembling a splinter of wood under the nail.

• It is black or reddish-brown
• It does not change appearance when you apply pressure to the nail
• Appears in one or more places under the nail
• It can also be skin cancer, such as melanoma or squamous cell cancer
• The thickest lines that create a horizontal stripe on the nail are called Beau's lines. They are usually not harmful, but they can be a symptom of cancer called subungual melanoma.

Symptoms of Red or Black Spots on Nails

• Tiny red or black dots under the nail (often resembling splinters)
• Streaks or lines that run vertically under the nail
• Discoloration spreading to the surrounding nail bed
• Pain or tenderness around the affected nail (if due to trauma or infection)
• Swelling or inflammation of the nail or surrounding skin
• Thickening or distortion of the nail plate
• Loosening or separation of the nail from the nail bed
• Signs of bleeding under the nail (subungual hematoma)
• Fungal changes, like yellowing or crumbling, are associated with infection
• Slow healing or persistent marks, which may require medical attention

Causes of Red or Black Spots on Nails

Splinter hemorrhages can develop after injury or trauma to a fingernail or toenail. Bumping a toe or injuring a toe can damage blood vessels along the nail bed in the affected toe and cause bleeding under the nail.

If you did not hurt your toe or finger, the bleeding may result from conditions that can damage blood vessels. The underlying conditions can include:

• Bacterial endocarditis: Bacteria in the bloodstream travel to the heart valve
• Vasculitis: Damage to the blood vessels caused by inflammation
• Systemic diseases: Systemic diseases cause inflammation in blood vessels, such as rheumatoid arthritis, nail psoriasis, lupus, scleroderma, peptic ulcer, malignant neoplasms
• Fungal Nail Infection: Infections can lead to thinning of the nail bed and possible damage to blood vessels
• Diabetes: High glucose levels can damage blood vessels
• Raynaud's disease: Fingers and toes become over-sensitive to cold, which can damage the capillaries in the nail bed
• Cholesterol: The accumulation of this substance in the blood vessels of the nails can cause damage
• Splinter bleeds can also occur as a side effect of certain medications, such as nonsteroidal anti-inflammatory drugs. These drugs can cause bleeding when taken in high doses.

When to Visit a Doctor?

It is especially important to see a doctor if a person has a painful, bleeding nail or changes with no known cause. Besides any of the following symptoms:

• Fever
• Petechiae, which are pin-sized red "spots" on the skin
• Joint pain

A person should consult their doctor if they notice changes in the quality of the nail, such as thinning, cracking, or differences in shape.

Diagnosis of Red or Black Spots on Nails

Your doctor may ask about your medical history and your family medical history. To determine the cause of splinter hemorrhages, laboratory procedures used include:

• Blood culture (detects bacteria or fungi in your blood)
• Complete blood count
• Erythrocyte sedimentation rate (detects inflammation in your body)

Your doctor may also order imaging tests to look for abnormalities. These include a chest X-ray and an echocardiogram, which takes pictures of your heart.

A hemorrhage under the nail is often a symptom of cancer called melanoma. If your doctor suspects a malignancy, they will recommend a biopsy to determine if the dark spot is cancerous or benign.

Treatment of Red or Black Spots on Nails

Treatment for splinter hemorrhage will vary depending on the underlying cause of the condition. Sometimes, you may not need any treatment, and the splinter hemorrhage will resolve as the nail grows.

If a splinter hemorrhage indicates another medical issue, consult your doctor for treatment. Conditions like endocarditis may require antibiotics and surgery. Chronic conditions like psoriasis may require various topical and oral treatments for management and prevention.

Prevention of Red or Black Spots on Nails

• Protect your hands and nails while doing heavy-duty tasks or using tools by wearing gloves.
• Trim nails regularly and keep them clean to avoid trauma and infections.
• Avoid biting your nails or picking at your cuticles to reduce the risk of injury and infection.
• Be cautious during manicures and pedicures, especially with sharp instruments.
• Moisturize nails and cuticles regularly to maintain healthy nail beds.
• Treat underlying health conditions, such as fungal infections, psoriasis, or circulatory issues, promptly.
• Maintain a balanced diet rich in vitamins and minerals for healthy nails.
• Manage blood pressure and diabetes, as uncontrolled conditions can affect circulation and nail health.
• Avoid repetitive trauma, such as tapping nails or wearing tight shoes.
• Seek medical attention for unexplained spots that persist, grow, or are painful.

Home Remedies for Red or Black Spots on Nails

• Apply Aloe Vera Gel: Soothes and hydrates nails, especially if the spots are due to minor trauma or dryness.
• Use Tea Tree Oil: It has antifungal and antibacterial properties. Mix with a carrier oil and apply to nails if a fungal infection is suspected.
• Warm Salt Water Soak: Soaking fingers in warm salt water can reduce inflammation and promote healing.
• Vitamin E Oil Massage: Boosts circulation and supports nail regeneration when massaged daily into the nail and cuticle.
• Turmeric Paste: Known for its anti-inflammatory benefits, apply a paste made with turmeric and water to the affected area.
• Garlic Oil: Acts as an antifungal. Crush garlic cloves in olive oil and apply to nails if infection is suspected.
• Balanced Diet: Eat foods rich in biotin, iron, and zinc to strengthen nails from within and promote recovery.
• Hydration: Drink plenty of water every day to prevent nail brittleness and damage caused by dehydration.
• Cold Compress: Helps reduce pain and swelling in case of nail trauma or injury.
• Avoid Nail Polish: Give your nails a break from chemicals that may worsen discoloration.