Why is My Mole Growing Bigger?

Moles are a common skin feature that most people have, often appearing as small, dark brown spots. Moles are usually harmless, but are they a cause for concern if they start growing bigger?

In this article, we will answer this question while discussing why a mole might increase in size. We will also distinguish between benign and concerning causes of mole size increase and share steps to take if you notice changes in your moles.

Benign reasons

Several benign reasons could explain why your mole is growing. These are generally harmless and not a cause for alarm.

Hormonal changes

Hormonal fluctuations can significantly impact your skin, including your moles. It’s common for moles to grow or darken during puberty, pregnancy, or while taking hormonal medications. Hormones can stimulate melanocytes, which produce pigment in moles, leading to their size and colour changes.


As we age, our skin undergoes many changes. Some moles may grow bigger or change in appearance due to the natural ageing process. This is generally benign, although any new moles appearing after age 30 should be monitored more closely.

Sun exposure

Prolonged exposure to ultraviolet (UV) radiation from the sun or tanning beds can cause moles to grow. UV rays can damage the DNA in skin cells, including those in moles, leading to an increase in size. You must shield your skin from excessive sun exposure to prevent mole growth and skin cancer.

Concerning reasons

While many reasons for mole growth are benign, some changes can indicate a more serious condition. Be aware of the following and monitor your moles for any suspicious changes.


Melanoma can develop in or near an existing mole. It’s the most severe form of skin cancer due to its ability to metastasise to other parts of the body.

Signs that a mole might be melanoma include asymmetry, irregular borders, multiple colours, a diameter larger than a pencil eraser, and any evolution in size, shape, or colour. If you notice these signs, it’s crucial to seek medical attention immediately.

Dysplastic nevi

Dysplastic nevi are atypical moles that can appear similar to melanoma. While not all dysplastic nevi turn into melanoma, having them can increase your risk of developing this type of skin cancer.

Dysplastic nevi are usually bigger than regular moles and have irregular borders and colour variations. Monitor these moles and have regular skin checks with a dermatologist.

What you should do

If you notice a mole growing bigger, the first step is to monitor it closely. Photograph the mole and measure its size regularly. Measuring changes can help you and your healthcare provider track its progress.

Practising good sun protection is also important. Wear sunscreen with at least SPF 30, stay in the shade during peak sun hours, and cover with protective clothing and hats. Avoid tanning beds, as they significantly increase your risk of skin cancer.

When to see a doctor

You should see a doctor if you notice any of the following changes in your mole:

  • Asymmetry: Half of the mole does not appear like the other half.
  • Border: The mole’s edges are irregular, ragged, or blurred.
  • Colour: The mole has multiple colours or shades.
  • Diameter: The mole is beyond 6 millimetres in size.
  • Evolution: The mole transforms in size, shape, or colour.
  • Irritation: If a mole itches, bleeds, or becomes painful.

The above symptoms can also be signs of skin cancer and should not be ignored.

Mole removal in Singapore

While a growing mole can be concerning, most growths are benign. Still, it’s essential to be vigilant for signs of melanoma and dysplastic nevi. Protect your skin, monitor your moles, and consult a healthcare provider if you notice any suspicious changes.

If you have a mole that you’re concerned about, whether for cosmetic reasons or health concerns, mole removal might be an option. DermAlly is a mole removal clinic in Singapore. Our team offers professional mole removal services.

Our skin specialists will examine the mole thoroughly before performing laser mole removal or excision, depending on its condition. We will ensure there is minimal scarring while completely removing the affected tissue.

Book an appointment today.

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