Mole Turned Black Suddenly: Common Causes and When to Book
If the mole is still there and has turned black over a few days, it is usually blood under the surface after a knock, or a clotted cherry angioma, black until a dermatoscope shows the red underneath [3]. A new black color or black dot in a mole is also a melanoma sign [2]. No injury? Book within 2 weeks [1].
Four things that turn a spot black in days
Blood under the surface after friction or a bump can darken quickly. A small bruise or clotted blood can look dark brown, blue-black, or black through the skin. This often follows rubbing from clothing, sports, or shaving, even if you did not notice it at the time.
A cherry angioma (a small red dome of blood vessels) can develop a clot and appear black until a dermatoscope shows the red color underneath [3]. If a spot that you thought was a mole turned jet black, consider our guide on cherry angioma vs melanoma for examples and next steps [3].
A seborrheic keratosis is a common, stuck-on growth whose colors include black, and it can become irritated and crusty if rubbed, which makes the surface look darker and uneven [4]. Our comparison guide on melanoma vs seborrheic keratosis explains how doctors tell them apart.
Pigment change inside a true mole is the one that matters most. A new black area, a black dot, or a mole that turned black suddenly are all color changes that need a doctor's assessment because color variation and evolving appearance are warning signs in the ABCDEs [2], and the NHS says to see a GP if a mole has changed color [1].
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"Part of my mole turned black": why one section matters more than the whole
If only part of a mole turned black, that still counts. In the ABCDEs, C for Color means more than one color in a single spot, and E for Evolving means any change you can point to [2]. A new black patch, streak, or center in a mole is enough reason to book.
The NHS advises seeing a GP if a mole has changed size, shape, or color, or if it is new in an adult [1]. That applies even if the rest of the mole looks the same. By contrast, many moles darkening together after a summer or during pregnancy is a different pattern; see our changing mole guide for context.
Black dot on a mole
A new black dot in the middle of a brown mole is a color change. Treat it the same way as a whole mole that turned black: take clear photos now for your appointment, then book. Photographing helps you and the clinician compare, but it is not a substitute for being seen [1][2].
Try to note when you first saw the dot and whether it is growing or spreading. Even a small dark speck is important if it is new, darker than the rest, or looks different from your other moles [2]. The booking line can record that the change was sudden [1].
Black after scratching or shaving
After scratching or shaving, a spot can bleed under the surface or form a dark scab, which may look black against the skin. If a mole or look-alike turned black or developed a black area after this, use our guide on a mole darker after scratching and the page on a mole that turned black and fell off for what to expect. If there is a new black color with no clear injury, or it persists as the skin heals, book within 2 weeks [1][2].
Is a black mole always melanoma?
No. Black is within the normal color range for some moles, and benign moles can be skin-colored, pink, brown, or black [5]. In darker skin, many typical moles look deep brown to black. What makes black a warning sign is that it is new, darker than the rest, or uneven within the same spot [1][2].
Also, not all melanomas are black. Some are black, red, or skin-colored, and a nodular melanoma can be a rapidly enlarging, firm lump [6]. If one spot stands out from the others or has changed, that is enough reason to book [1][2].
The $4.99 photo check describes what is visible in a photo of the mole; it cannot tell blood from pigment and does not diagnose, so it sits alongside the appointment, not instead of it.
When to see a doctor
See a doctor today: it is bleeding and will not stop with pressure, or it is painful, swollen, and has spreading redness, heat, pus, or you have a fever.
Book within 2 weeks: a mole turned black or developed a black area with no injury; the black part is uneven, spreading, or raised; it also itches, bleeds, or crusts; or the spot is new in an adult. The NHS says to see a GP if a mole has changed size, shape, or color, and the AAD lists color variation and evolving change as warning signs [1][2]. Say the change was sudden when you book.
Book in the next few weeks: a uniformly dark mole you have had for years that you only now noticed, with no specific change you can point to.
Mention it at your next check-up: several moles darkened evenly after a summer or during pregnancy and look alike.
If the triage above fits your situation, book a doctor accordingly. For your other spots, try the free ABCDE checker to answer quick color and change questions before your appointment.
Go through the free ABCDE questionsFrequently asked questions
Can a mole turn black overnight?
A spot can look black within days if it bled under the surface or if a cherry angioma developed a clot that appears black until examined with a dermatoscope [3]. But a new black color or a black dot in a mole still counts as a color change and should be booked within 2 weeks [1][2].
Can sun make a mole black?
Sun can tan the skin and make many moles darken together. That pattern is different from one mole turning distinctly black or developing a new black area. If one spot has changed color or looks different from your others, book; color variation and evolving change are warning signs [1][2].
What will the doctor do?
They will examine the spot, often compare it to your other moles, and may use a dermatoscope. If melanoma is suspected, the NHS refers you to a specialist, with an appointment within 2 weeks [1]. Color variation and recent change are key reasons for referral under ABCDE and NHS criteria [1][2].
Sources
- NHS. Moles. nhs.uk, accessed Oct 2026.
- American Academy of Dermatology. What to look for: ABCDEs of melanoma. aad.org, accessed Oct 2026.
- DermNet. Cherry angioma: features, causes, and removal. dermnetnz.org, accessed Oct 2026.
- DermNet. Seborrhoeic keratoses. dermnetnz.org, accessed Oct 2026.
- DermNet. Moles (melanocytic naevi). dermnetnz.org, accessed Oct 2026.
- DermNet. Nodular melanoma. dermnetnz.org, accessed Oct 2026.
Each source was opened and checked against the sentence it supports. How we write our guides