Symptom triage · Black spot
Non-Healing Black Spot on Skin — Should I Worry?
Quick answer
Yes — get a black spot that won't heal checked promptly. Persistent dark marks that refuse to close or resolve after several weeks require professional evaluation because skin that fails to repair itself often indicates a deeper issue. While many dark patches are simply old bruises or stubborn clotted blood under the skin surface, a spot that bleeds easily or feels firm to the touch can be a warning sign of melanoma. Most benign lesions will fade or flake away within a month, so a stationary or growing mark is the primary concern. You should not panic immediately, as early detection usually leads to excellent outcomes and simple treatments. However, the diagnosis shifts from routine monitoring to an urgent priority if you notice the lesion growing in diameter or if the skin starts to crust over without a clear injury. A quick biopsy provides the only definitive answer and peace of mind. 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 won't heal checked promptly
Persistent dark marks that refuse to close or resolve after several weeks require professional evaluation because skin that fails to repair itself often indicates a deeper issue. While many dark patches are simply old bruises or stubborn clotted blood under the skin surface, a spot that bleeds easily or feels firm to the touch can be a warning sign of melanoma. Most benign lesions will fade or flake away within a month, so a stationary or growing mark is the primary concern. You should not panic immediately, as early detection usually leads to excellent outcomes and simple treatments. However, the diagnosis shifts from routine monitoring to an urgent priority if you notice the lesion growing in diameter or if the skin starts to crust over without a clear injury. A quick biopsy provides the only definitive answer and peace of mind.
What to look for
Suspicious characteristics often begin with an uneven shape where one half of the mark does not match the other side in size or profile. You should pay close attention to the edges of the spot, looking for blurred or jagged borders that seem to bleed into the surrounding healthy skin rather than having a clear boundary. Color is another major indicator, specifically if you see a mix of shades like deep blue, grey, or jet black combined with reddish tones. Check if the texture feels significantly harder than the skin around it or if a raised bump has developed in the center. Tiny new specks appearing around the main lesion or a sudden change in surface moisture are also reasons to seek a medical opinion quickly to rule out cancer before it progresses further.
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 won't heal checked promptly. Persistent dark marks that refuse to close or resolve after several weeks require professional evaluation because skin that fails to repair itself often indicates a deeper issue. While many dark patches are simply old bruises or stubborn clotted blood under the skin surface, a spot that bleeds easily or feels firm to the touch can be a warning sign of melanoma. Most benign lesions will fade or flake away within a month, so a stationary or growing mark is the primary concern. You should not panic immediately, as early detection usually leads to excellent outcomes and simple treatments. However, the diagnosis shifts from routine monitoring to an urgent priority if you notice the lesion growing in diameter or if the skin starts to crust over without a clear injury. A quick biopsy provides the only definitive answer and peace of mind. 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 any sore, scab or ulcer that fails to fully heal within 4–6 weeks deserves dermatology review — non-healing is a classic feature of basal and 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.