Symptom triage · Black spot
Painful Black Spot on Skin — Should I Worry?
Quick answer
Yes — get a black spot that hurts checked promptly. Noticing a dark lesion that causes physical discomfort can be unsettling, but pain is actually more common in benign skin damage than in life-threatening conditions. In most cases, a sore dark mark is the result of a subungual hematoma, which is just a bruise under the nail, or an infected hair follicle that has darkened due to trapped blood or inflammation. These typically heal on their own as the skin sheds or the bruise grows out. However, you should not ignore a spot that remains painful while also changing shape or becoming increasingly firm. If the sensation feels like a deep ache or if the area starts to bleed without an injury, the situation shifts from routine monitoring to an urgent need for a professional evaluation to ensure your skin health is not at risk. Next step: seek same-week medical review (same day if also bleeding heavily, spreading or with fever).
Seek prompt review
Yes — get a black spot that hurts checked promptly
Noticing a dark lesion that causes physical discomfort can be unsettling, but pain is actually more common in benign skin damage than in life-threatening conditions. In most cases, a sore dark mark is the result of a subungual hematoma, which is just a bruise under the nail, or an infected hair follicle that has darkened due to trapped blood or inflammation. These typically heal on their own as the skin sheds or the bruise grows out. However, you should not ignore a spot that remains painful while also changing shape or becoming increasingly firm. If the sensation feels like a deep ache or if the area starts to bleed without an injury, the situation shifts from routine monitoring to an urgent need for a professional evaluation to ensure your skin health is not at risk.
What to look for
Visible clues can help you determine if the dark mark warrants more attention from a doctor. Keep a close eye on the edges of the lesion; if the border starts to look jagged or blurry rather than smooth and distinct, it is a sign to seek help. Pay attention to how the color is distributed across the area. While a uniform dark tone is often normal, a mixture of shades like deep navy, charcoal, and reddish-brown can be a red flag. You should also feel the spot to see if it is notably harder than the surrounding tissue or if the surface texture has become scaly or crusty. Any growth that stands out as the odd one out compared to other moles on your body, particularly when it displays asymmetry, suggests that melanoma should be ruled out quickly.
Most likely causes
Melanoma
Black, irregular spots — especially new or changing — must be checked promptly.
Seborrhoeic keratosis
Can appear very dark but has a waxy, stuck-on surface.
Blue naevus
Benign blue-black mole that has been stable for years.
Subungual haematoma
Blood under the nail from trauma — grows out with the nail.
Red flags — get reviewed
- •Any new black spot in an adult
- •Black streak under a fingernail or toenail (especially if it widens)
- •Changing colour, size, shape or texture
- •Bleeding, crusting or ulceration
What you can do while you decide
- ✓Get any new black spot assessed within 2–4 weeks
- ✓Do not attempt removal at home
- ✓Photograph and date any existing dark mole you want to monitor
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Check my black spot →Frequently Asked Questions
Yes — get a black spot that hurts checked promptly. Noticing a dark lesion that causes physical discomfort can be unsettling, but pain is actually more common in benign skin damage than in life-threatening conditions. In most cases, a sore dark mark is the result of a subungual hematoma, which is just a bruise under the nail, or an infected hair follicle that has darkened due to trapped blood or inflammation. These typically heal on their own as the skin sheds or the bruise grows out. However, you should not ignore a spot that remains painful while also changing shape or becoming increasingly firm. If the sensation feels like a deep ache or if the area starts to bleed without an injury, the situation shifts from routine monitoring to an urgent need for a professional evaluation to ensure your skin health is not at risk. The safest next step is: seek same-week medical review (same day if also bleeding heavily, spreading or with fever).
Key red flags include: Any new black spot in an adult; Black streak under a fingernail or toenail (especially if it widens); Changing colour, size, shape or texture; Bleeding, crusting or ulceration. Any of these alone is reason to book a dermatology assessment promptly.
The most common causes are Melanoma, Seborrhoeic keratosis, Blue naevus, Subungual haematoma. Most are benign, but pain often points to inflammation, infection or pressure on a nerve, but tenderness in a slowly-growing skin lesion can also signal squamous cell carcinoma.
Seek same-week medical review (same day if also bleeding heavily, spreading or with fever). Seek same-day care for: heavy bleeding, rapidly spreading redness with fever, severe pain, or a new black streak under a fingernail or toenail.
Yes — ScanSkinAI's free AI mole and skin checker analyses a photo within seconds and flags ABCDE-style warning features. It is a screening aid, not a diagnosis, and a clinician should always confirm any concerning result.
Other black spot concerns
Medical disclaimer: This page is for general information and is not a substitute for professional medical advice, diagnosis or treatment. Always consult a qualified clinician about any concerning skin change. ScanSkinAI is a screening aid, not a diagnostic device.