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What Causes Moles?

causes moles london treatment

Clothes and jewellery rubbing against skin is annoying as it is, but can become even more grating if it rubs against something more sensitive, like a mole. The average person has anywhere between 10 and 50 moles (also called melanocytic naevi) on their body, with between 5 and 10% of the population possessing an atypical mole.

Hormonal imbalances or changes can cause the development of moles, which occur when melanocytes (pigment cells) grow in a cluster. This includes pregnancy, which can cause darkening, adolescence, in which moles may appear, and ageing (40-50+), in which time moles can disappear.

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Commom Moles

There are a few types of common moles, that are completely normal, and more that are rare.

Standard Moles

Junctional Melanocytic Naevi – these are usually flat, round, and brown in colour.

Dermal Melanocytic Naevi – usually raised and pale, these moles can sometimes be hairy.

Compound Melanocytic Naevi – similar to dermal melanocytic naevi, these are raised and sometimes hairy, but are darker in colour.


Halo Naevi – so called because of the ring of paler skin that surround them

Atypical Naevi – (also called dysplastic naevi) are slightly larger, and may be rough or bumpy, and are seen in a range of colours

Blue Naevi – these are dark blue due to the pigment being deeper in the skin

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If you are worried about a mole, you should always consult your physician. The NHS recommends adhering to the ABCDE rule; if you notice changes or issues with Asymmetry, Border (irregularity), Colour, Diameter, or Enlargement/Elevation, you should see a professional. To reduce the likelihood of mole development or growth, it is recommended that you limit the amount of time you spend in the sun, and if not, cover up and use a broad spectrum sunscreen (that protects against UVA and UVB rays).

You should also try to avoid sunlamps or sunbeds, as they can have a detrimental effect.

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