Hyperpigmentation on the lips is very common and has a wide range of causes. It is usually harmless and happens when excess melanin forms deposits in the skin, causing dark patches on the lips. When the pigmentation is extensive or stands out against the rest of the lip, it can become a cosmetic concern. There is no shortage of beauty products promising to lighten dark lips, but very few work as well as they claim. Below, we take a closer look at what causes lip hyperpigmentation and review the treatments that actually work.
What Causes Hyperpigmentation on the Lips?
Lip hyperpigmentation is where parts of the lips develop a darker colour than the surrounding area. This can be a diffuse darkening or more localised dark spots. It is usually harmless and mainly a cosmetic issue. However, lip hyperpigmentation can occasionally be a sign of an underlying health condition or, rarely, something more serious. That is why it is worth understanding the causes and seeking medical advice if you notice any worrying changes.
Hyperpigmentation occurs when there is an overproduction of melanin, the pigment that gives our skin and lips their colour. It is usually a gradual process. The areas of higher melanin can form patches, spots or cover the whole lip.The colour can also range from light brown to nearly black depending on how much excess melanin there is and your natural skin tone. Several things can trigger this excess melanin. The most common causes are:
- Genetics: Hereditary factors play a significant role in lip pigmentation. A genetic predisposition can mean naturally darker lips, and this is more common in people with a family history of darker lips and in those with skin of colour. Unlike pigmentation triggered by external factors, hereditary pigmentation is usually uniform in colour and distribution. It is a natural lip colour and does not need treating. That said, when there is a stark difference (often a much darker upper lip than lower) some people choose to even it out with lip-lightening treatments.
- Sun exposure: This is one of the main causes of lip hyperpigmentation. The delicate skin of the lips is particularly vulnerable to UV, which prompts the pigment-making cells (melanocytes) to produce more melanin as a defence. The lips also lack the protective hair and sweat glands found elsewhere and have fewer melanocytes to begin with, so any increase is more noticeable. On top of this, most people leave the lips out of sun protection. In fact, the majority of us do not use a lip balm with SPF. Over time, this leads to a build-up of melanin that shows as darkened patches or an overall darker tone that can be hard to reverse.
- Hormonal changes: Hormone fluctuations can have a significant effect on pigmentation, including on the lips. Melasma, which is triggered by hormonal changes, causes the overproduction of melanin and dark patches. These are most common on the face but can extend to the top of the lips. It is particularly common in pregnancy (the “mask of pregnancy”) and can also occur with hormonal contraceptives or hormone replacement therapy. The discolouration can fade after pregnancy or when hormone treatments stop, but in some cases it persists.
- Vitamin deficiencies: A deficiency in vitamin B12 in particular can cause visible changes in skin pigmentation, including on the lips. It plays a crucial role in producing DNA and red blood cells, and a deficiency is thought to raise homocysteine levels, which in turn may increase melanin production. On the lips this can appear as dark spots or a general darkening, and it is most noticeable in people with naturally lighter lips. In many cases, correcting the deficiency through diet or supplementation gradually lightens the affected areas.
- Medications: Lip discolouration is a lesser-known but not uncommon side effect of some medicines. Chemotherapy drugs, antimalarials, antipsychotics, anticonvulsants and heavy metals can all trigger an overproduction of melanin, leading to darker patches or a generalised darkening. It tends to be more pronounced in darker skin tones. Some medication-induced pigmentation resolves once the drug is stopped, but not always.
- Smoking: Alongside its many serious risks, smoking is a possible cause of lip hyperpigmentation. The nicotine and other chemicals in tobacco trigger an increase in melanin, and chronic exposure to the heat and smoke darkens the lips over time, often in an uneven, blotchy pattern. Smoking also worsens circulation, which adds to the darkening. It is most pronounced in long-term smokers.
- Allergic reactions: Allergic contact dermatitis is a common but under-recognised cause. When the lips react to an allergen (such as fragrances, preservatives or colouring agents in lipsticks, balms or dental products) the resulting inflammation can darken the area as it heals. People with sensitive skin are particularly prone to this.
How to Prevent Darkening of Lips
There is not much you can do about hyperpigmentation that is genetic. However, you can prevent darkening caused by the external factors above. The best approach is to protect the lips from the sun, avoid smoking and use hypoallergenic lip products if you have sensitive skin. Your regular lip care routine should include a moisturiser, gentle exfoliation and a daily lip SPF to keep the lip skin healthy and prevent darkening. If you start a new medication and notice your lips darkening, check with your doctor, who may be able to adjust the type or dose.
Best Treatments for Lip Hyperpigmentation
Fading hyperpigmentation on the lips is a delicate process that needs careful treatment selection. The lips are a highly functional area, so any treatment must be gentle and non-toxic if accidentally swallowed. Most people do well with a topical treatment, though some will need professional treatments. Whatever the approach, daily broad-spectrum lip SPF is essential to protect against the UV that worsens pigmentation, and it is crucial to address any underlying cause.
Topical pigment fading and exfoliating treatments can help even out lip hyperpigmentation. Because the skin of the lips is so delicate, these should be used with caution and ideally under medical supervision. The most effective topical skincare ingredients for fading lip hyperpigmentation include:
- Hydroquinone: The gold standard in skin lightening, hydroquinone works by inhibiting an enzyme needed for melanin production. It is a prescription-only medicine in the UK and, while effective, needs care on the delicate lip skin as it can cause irritation. It is usually limited to short courses at a time because of the risks of rebound hyperpigmentation and ochronosis.
- Arbutin: A gentler skin-brightening agent that targets the same pathway as hydroquinone but is less potent and less irritating. Arbutin is available over the counter and best suited to moderate hyperpigmentation and lighter skin tones.
- Kojic acid: Another over-the-counter option, kojic acid helps lighten lip hyperpigmentation. It is often combined with ingredients like niacinamide, vitamins C and E to boost its effect and add antioxidant benefits.
- Tranexamic acid: With skin-brightening and anti-inflammatory properties, tranexamic acid is useful for lip hyperpigmentation. This is especially where the darkening is due to melasma or sun damage.
- Azelaic acid: This exfoliating acid reduces inflammation and helps fade hyperpigmentation. Azelaic acid is gentle, which makes it particularly useful for sensitive skin.
- Retinoids: From over-the-counter retinol to prescription tretinoin, retinoids speed up cell turnover and help fade hyperpigmentation. They can cause irritation and are not suitable for everyone, so if you use an over-the-counter retinoid, choose one designed for the lips. For more stubborn hyperpigmentation, some dermatologists may prescribe tretinoin often in combination with pigment suppressors like hydroquinone.
Beyond skincare, chemical peels and laser therapy are the main professional options for fading lip hyperpigmentation. Because lip skin is so sensitive, these must be performed by an experienced practitioner. Strict sun protection during and after treatment is vital to prevent further pigmentation, and any underlying cause must be addressed. The key professional treatments for lip hyperpigmentation include:
- Chemical peels: Mild chemical peels containing alpha hydroxy acids gently exfoliate the surface layers of skin. Over a course of treatments, they can help lighten pigmentation on the lips. Care is needed especially in skin of colour, where peels can trigger post-inflammatory hyperpigmentation.
- Laser therapy: Lasers such as Q-switched or fractional lasers can target melanin specifically and break it down without damaging the surrounding tissue. Because of the precision needed around the lips, this should only be done by a qualified professional.
Lip hyperpigmentation is usually a benign cosmetic concern. However, it is always worth seeing a doctor first to rule out an underlying health condition or a medication cause. Lifestyle factors like smoking and sun exposure can cause or worsen it, so addressing these matters too. When it comes to treatment, there are several good options. However, due to the sensitive and functional nature of the lips, you should proceed with care. Only use over-the-counter products designed and safety-tested for the lips. For prescription-only medicines see a doctor or qualified healthcare professional who can work out what is best for you and provide a safe, effective protocol. Whatever you choose, responses vary from person to person and it often takes time and consistency.
At City Skin Clinic, we are passionate about personalised skincare. Through our online skin clinic, our doctors offer bespoke hyperpigmentation treatments using ingredients like tretinoin, hydroquinone, azelaic acid, niacinamide and tranexamic acid where appropriate. Our doctors treat acne, hyperpigmentation, melasma, rosacea and skin ageing through bespoke compounded treatments designed around your specific skin. To start your personalised skincare plan, book a virtual video consultation or use our online consultation form. The journey towards great skin starts here.
This article is for informational purposes only and is not a substitute for medical advice, diagnosis or treatment. Always consult a qualified medical provider for any concerns or questions you might have.
