Melasma is a type of hyperpigmentation that is common in women, especially during and after pregnancy. It appears as large dark patches of discolouration on the face although other parts of the body can be affected.
The pigment melanin defines the colour of a person’s eyes, hair and skin. Certain internal and external factors, such as exposure to the sun, genetics, hormonal changes, inflammation and age can affect the production of melanin. Over-production leads to hyperpigmentation, whereby dark spots and uneven skin tones appear. Under-production - hypopigmentation – has the opposite effect, with pigment-free spots developing in affected areas.
Melasma is a form of hyperpigmentation that appears on the face, especially on the cheeks, bridge of the nose, forehead and upper lip and sometimes on other sun-exposed parts of the body, such as the forearms.
There are three types of melasma: epidermal, dermal and mixed.
Melasma is most common in women – only 10% of cases are male - affecting up to 90% of pregnant women.
For that reason it is also known as “the mask of pregnancy” (or chloasma). While all ethnics are affected, people with darker skin tones are more prone. Unlike age spots, melasma can disappear of its own accord after birth, or if oestrogen intake is reduced.
Melasma is caused by the over-production of the pigment melanin. Whilst the condition usually occurs as a response to hormonal changes, such as pregnancy, birth control pills or hormone replacement therapy (HRT), other factors such as UV-exposure, family predisposition, age and certain anti-epilepsy drugs can also play a role.
Melanocytes (the melanin-producing cells located in the basal layer of the epidermis) are responsible for increased epidermal pigmentation in melasma.
During pregnancy endogenous hormones stimulate the melanocytes, causing them to produce more melanin pigments.
There are two options available to sufferers of melasma – removal of the discoloured skin or regulation of the pigment.
Removal is done by laser therapy, intense pulse light or chemical peel. These can be expensive and invasive and can actually trigger post-inflammatory hyperpigmentation, especially on darker skin tones. Potential side effects include inflammation, irritation and a burning sensation.
Laser therapies (Fraxel, Erbium YAG) and Intense Pulse Light (IPL)
More precise than chemical peels, laser therapies use high-energy lights to target affected areas. This deletes hyperpigmented skin cells, at surface (epidermis) level or deeper (dermis), depending on the severity of symptoms.
Chemical peels eg. AHA
With chemical peels the dermatologist applies an acidic solution (Glycolic Acid (AHA)) to treat the affected layers of skin. Skin tends to blister, then peel, revealing unblemished skin beneath.
Alternatively, to regulate skin colouration, a number of topical medical or skincare products have also become available in recent years. These usually contain one or more of the following ingredients:
Talk to your dermatologist or pharmacist if any of your dark spots are new, have changed in appearance, or look different to your other spots.