Why Is My Toenail Purple? 7 Causes & When to Worry

A purple toenail almost always signals blood trapped beneath the nail plate — a condition called subungual hematoma — typically caused by trauma, tight shoes, or repetitive pressure from running or hiking, though it can also indicate fungal infection, poor circulation, or (rarely) melanoma.

If your big toenail has turned purple, blue, brownish, or even half black, don't panic: most cases resolve on their own as the nail grows out. However, knowing when discoloration points to something more serious can save you pain and catch potential health problems early. Below, you'll find the most common causes of toenail discoloration in 2026, how to tell them apart, and exactly when you should see a doctor.

What Causes a Purple or Discolored Toenail?

Toenail discoloration happens when blood pools under the nail, when fungal organisms invade the nail bed, when circulation decreases, or when pigment-producing cells (melanocytes) become overactive or malignant.

The specific shade of your toenail — purple, blue, black, brown, or orange — offers important clues about what's happening underneath. Here's a breakdown of the most common culprits:

Is It a Subungual Hematoma (Blood Under the Nail)?

The most frequent cause of a purple, blue, or black toenail is a subungual hematoma — essentially a bruise trapped between your nail and nail bed. This happens when blood vessels rupture from impact or pressure. You might notice your toenail darkening within hours of stubbing it, dropping something heavy on it, or finishing a long run.

"Subungual hematomas are caused by an injury to the blood vessels under the nail, resulting in blood accumulation. Common causes include stubbing a toe, dropping heavy objects on the foot, or wearing tight-fitting shoes." — American Academy of Dermatology

The discoloration typically starts red, then shifts to purple or blue as the blood oxidizes, and eventually turns brown or black as it ages. If you remember a specific injury, this is almost certainly your culprit.

Can Tight Shoes Make Your Toenail Purple?

Absolutely — and this is one of the most overlooked causes. Shoes that crowd your toes create repetitive microtrauma with every step. Your toenail slams against the shoe's interior dozens of times per minute, gradually damaging tiny blood vessels. Runners, hikers, and people who wear steel-toed work boots frequently develop what's sometimes called "runner's toe" or "black toenail syndrome."

The discoloration may appear gradually over weeks rather than suddenly, and it often affects the big toe because it bears the most pressure. If your toenail is darkening and you've recently increased your walking or running mileage — or bought new shoes — this is a prime suspect.

Also Read: Why Is My Second Toe Longer Than My Big Toe? Morton's Toe Explained

Why Is My Toenail Brown, Orange, or Partially Black?

Brownish, orange, or partially black toenails often indicate fungal infection, old dried blood, nail psoriasis, or the beginning stages of melanocytic changes — the cause depends heavily on the pattern and how the discoloration developed.

Could It Be a Fungal Infection?

Onychomycosis (fungal nail infection) affects up to 14% of the American population and frequently causes brownish, yellowish, or orange discoloration. Unlike trauma-related bruising, fungal discoloration typically:

• Starts at the tip or edge of the nail and spreads toward the cuticle
• Makes the nail thicker and more brittle
• Creates a crumbly, chalky texture
• May produce a foul odor

If your toenail is brownish or orange and also thickening, fungus is a strong possibility. Fungal infections don't resolve on their own and often require treatment.

Also Read: Why Is My Toenail So Thick? 7 Causes & How to Fix It

What Does a Half-Black Toenail Mean?

A toenail that's half black (usually the outer or lower half) typically indicates one of two things:

1. Partial subungual hematoma: Blood pooled in one section of the nail bed, often because the trauma hit at an angle
2. Melanonychia striata: A longitudinal dark band running from cuticle to tip, caused by melanin deposits

Melanonychia can be benign (normal pigmentation variation, especially in darker-skinned individuals) or it can signal subungual melanoma, a rare but serious form of skin cancer. The key difference: a traumatic hematoma grows out with the nail and fades over months, while melanoma-related bands stay fixed in position or widen over time.

Circulation Problems: When Purple Toenails Signal Something Deeper

Toenails that turn blue or purple without any injury may indicate poor blood flow from conditions like peripheral artery disease (PAD), Raynaud's phenomenon, or venous insufficiency.

If your toenail is purple and you notice other symptoms — cold feet, numbness, tingling, skin color changes, or slow-healing wounds — circulation problems deserve serious attention.

What Is Raynaud's Phenomenon?

Raynaud's causes blood vessels in the extremities to overreact to cold or stress, dramatically reducing blood flow. During an episode, affected toes (and fingers) may turn white, then blue or purple, then red as circulation returns. The nail itself can take on a bluish or purple tinge during or after episodes.

Could It Be Peripheral Artery Disease?

PAD occurs when plaque buildup narrows the arteries supplying your legs and feet. Reduced blood flow can cause chronic purple or blue discoloration in toenails, along with:

• Leg pain when walking (claudication)
• Cold feet compared to the rest of your body
• Slow toenail growth
• Shiny, tight skin on the legs

"Peripheral artery disease is often underdiagnosed. Symptoms like cold feet, slow-healing sores, and nail color changes should prompt evaluation." — Cleveland Clinic

If you're over 50, smoke, have diabetes, or have high blood pressure, PAD risk increases significantly.

Also Read: Why Is My Body Warm but Feet Are Cold? 8 Causes & Fixes

Toenail Discoloration by Color: A Quick Reference Guide

When Should You See a Doctor About Toenail Discoloration?

Seek medical evaluation if your toenail discoloration appeared without injury, doesn't grow out after 6–9 months, changes shape or widens, or is accompanied by other symptoms like pain, swelling, or drainage.

Here are specific red flags that warrant a prompt appointment in 2026:

• Dark streak that doesn't move: A healthy nail grows approximately 1 mm per month. If a dark band stays fixed while the nail grows, it may indicate melanoma
• Irregular borders: Melanoma-related pigmentation often has blurry or uneven edges
• Discoloration spreading to surrounding skin: Pigment extending beyond the nail (Hutchinson's sign) is a melanoma warning sign
• Severe pain or throbbing: While some discomfort is normal with a hematoma, intense pain may indicate infection or the need for drainage
• Signs of infection: Pus, increasing redness, warmth, or red streaks traveling up the foot
• Unexplained discoloration in multiple nails: May suggest systemic conditions affecting circulation or overall health

A dermatologist or podiatrist can examine the nail, perform dermoscopy (a magnified examination), and take a biopsy if melanoma is suspected.

How to Treat a Purple or Discolored Toenail at Home

Most trauma-related toenail discoloration resolves without treatment as the nail grows out over 6–12 months, but you can speed healing and prevent complications with proper care.

For Subungual Hematoma (Blood Under the Nail)

1. Ice immediately: Apply ice wrapped in a cloth for 15–20 minutes to reduce swelling
2. Elevate your foot: Keep it above heart level when possible for the first 48 hours
3. Protect the nail: Avoid tight shoes and further trauma
4. Don't pierce the nail yourself: While doctors can safely drain hematomas, home attempts risk infection

If the hematoma covers more than 25% of the nail and is extremely painful, a doctor can perform trephination — creating a small hole to release the pressure. This provides immediate relief and is done under sterile conditions.

For Fungal Infections

• Over-the-counter antifungal treatments (creams, lacquers, or nail solutions) may help mild cases
• Prescription oral antifungals are more effective for moderate to severe infections
• Keep nails trimmed short and dry
• Disinfect nail tools and change socks daily

For Circulation-Related Discoloration

• Keep feet warm
• Exercise regularly to improve blood flow
• Quit smoking if applicable
• Manage underlying conditions (diabetes, high blood pressure) with your doctor's guidance

In Short

A purple, blue, brown, or black toenail usually results from trauma (subungual hematoma) or fungal infection — both of which are treatable and rarely serious. However, discoloration that appears without injury, doesn't grow out with the nail, or changes shape requires professional evaluation to rule out melanoma or circulation problems. Most cases resolve on their own within 6–12 months as the healthy nail grows in.

What You Also May Want To Know

Why is my big toenail purple but doesn't hurt?

A painless purple big toenail often indicates a minor hematoma from microtrauma you didn't notice — typically from tight shoes or repetitive pressure during walking or exercise. The blood pooled slowly without enough nerve irritation to cause pain. It can also signal slow-developing fungal infection or mild circulation changes. As long as the discoloration is growing out with the nail and not widening, it's usually nothing to worry about.

Why is my toenail black underneath but I don't remember injuring it?

"Forgotten trauma" is surprisingly common — you may have bumped your toe lightly or worn tight shoes for an extended period without registering it as an injury. However, black discoloration under the nail without any recalled trauma should be monitored closely. If the dark area doesn't move as your nail grows over 2–3 months, or if it forms a vertical stripe, see a dermatologist to rule out subungual melanoma.

Can nail polish cause purple or discolored toenails?

Yes, dark nail polishes (especially reds, purples, and blues) can stain the nail plate if worn continuously without a base coat. This staining is superficial and typically fades after a few weeks of going polish-free. However, true discoloration from underneath the nail — especially if accompanied by pain, thickness, or texture changes — isn't caused by polish and warrants investigation.

How long does it take for a bruised toenail to heal?

A full recovery takes 6–12 months because the discolored portion must grow out completely. Toenails grow slowly — roughly 1.5 mm per month — so a hematoma at the base of the nail could take nearly a year to disappear. The nail won't look normal overnight, but you should see steady progress with each trim. If the discoloration hasn't moved at all after 3 months, consult a doctor.

Should I be worried about melanoma if my toenail is darkening?

Subungual melanoma is rare (accounting for only about 0.7–3.5% of all melanomas in Caucasians, though higher in darker-skinned individuals), but it's worth knowing the warning signs: a dark longitudinal band that doesn't grow out, irregular or blurry borders, pigment spreading to the skin around the nail, and width that increases over time. If you have any of these features, schedule an appointment with a dermatologist. Early detection dramatically improves outcomes.

Reviewed and Updated on June 2, 2026 by George Wright