Vitiligo

Vitiligo is a chronic autoimmune disorder that causes patches of skin to lose pigment or colour, resulting in white spots. It affects approximately 1% of the global population and can occur at any age, though it often begins before the age of 20. The condition is more noticeable in individuals with darker skin tones. In this article, we will delve into the causes, symptoms, and available treatment options for vitiligo.

What is Vitiligo?

Vitiligo is a disease characterised by the destruction of melanocytes, the skin cells responsible for producing melanin, the pigment that gives skin its colour. This destruction is caused by the body's immune system attacking these cells, leading to patches of skin losing their colour and turning white. The condition can affect any part of the body, including the skin, hair, and mucous membranes.

Vitiligo is categorised into several types based on the pattern and extent of depigmentation:

• Generalised (nonsegmental) vitiligo: The most common type, characterised by widespread and randomly distributed areas of depigmentation across the body, often appearing symmetrically.

• Segmental (unilateral) vitiligo: A less common type where depigmentation occurs on one side or segment of the body, such as one leg or one side of the face, and tends to stabilise after 6 to 12 months.

• Focal vitiligo: A type where there are a few scattered macules in one area, commonly seen in children.

• Acrofacial vitiligo: Depigmentation affecting the fingers and periorificial areas.

• Mucosal vitiligo: Depigmentation limited to the mucous membranes.

• Universal vitiligo: A rare type where depigmentation covers most of the body.

• Mixed type vitiligo: A combination of segmental and generalised vitiligo.

The symptoms of vitilago can manifest in different ways:

• Patchy Loss of Skin Colour: The most noticeable symptom is the development of smooth white or light patches on the skin, known as macules or patches.

• Hair colour changes: Premature whitening or greying of hair on the scalp, eyelashes, eyebrows, or beard can occur.

• Mucous membrane involvement: Loss of colour may affect the tissues lining the inside of the mouth and nose.

Some additional symptoms that may accompany vitiligo include:

• Itchy skin before depigmentation starts

• Eye problems like inflammation or swelling (uveitis)

• Increased susceptibility to painful sunburns on affected skin areas

The exact cause of vitiligo, where pigment-producing cells (melanocytes) die or stop producing melanin, remains unclear. However, several factors are thought to play a role:

• Autoimmune condition: The immune system mistakenly attacks and destroys melanocytes

• Family history: Genetic predisposition, with about 30% of cases being hereditary

• Trigger events: Stress, severe sunburns, or exposure to certain chemicals can trigger or worsen vitiligo

• Other possible causes: Research suggests links to autoimmune disorders like type 1 diabetes, Addison's disease, and thyroid autoimmune disorders

In addition to these primary causes, some other factors that may contribute to the development of vitiligo include:

• Neurochemical factors like an imbalance in neurotransmitters

• Oxidative stress leading to melanocyte damage or death

• Viral infections potentially triggering an autoimmune response

• Deficiency of melanocyte growth factors

The complex interplay of genetic, environmental, and immunological factors likely underlies the pathogenesis of vitiligo. Understanding these causes aids in developing targeted therapies.

Although the precise causes of vitiligo remain unclear, research has identified several risk factors and conditions that may be associated with its development:

• Genetic predisposition appears to play a role, as vitiligo can run in families, suggesting an inherited component.

• Autoimmune disorders, such as thyroid disease, diabetes, and rheumatoid arthritis, are often linked to vitiligo, indicating a potential autoimmune mechanism targeting melanocytes.

• Stress, both physical and emotional, has been implicated as a trigger for vitiligo onset or exacerbation.

• Skin trauma, including sunburns, cuts, or chemical exposures, may precipitate vitiligo in susceptible individuals.

• Exposure to certain chemicals, such as phenols found in hair dyes and industrial products, has been associated with an increased risk of developing vitiligo.

• Hormonal changes, particularly during pregnancy, menopause, or thyroid dysfunction, may influence the course of vitiligo.

• Vitamin deficiencies, especially vitamin B12, folate, and vitamin D, have been observed in some individuals with vitiligo.

Vitiligo can lead to several complications that extend beyond the skin. These may include:

• Increased risk of developing other autoimmune disorders, such as Type 1 diabetes, Addison's disease, psoriasis, rheumatoid arthritis, lupus, thyroid autoimmune disorders, and pernicious anaemia

• Eye problems, including inflammation of the iris and uveitis

• Heightened sensitivity to sunlight, making the affected skin more vulnerable to sunburn and increasing the risk of skin cancer

• Psychological distress, such as low self-esteem, anxiety, and depression, stemming from the altered appearance of the skin

• Potential hearing loss in some individuals

As the exact causes of vitiligo are not fully understood, there are no guaranteed ways to prevent its onset. However, some strategies may help minimise triggers and manage the condition:

• Protect the skin from excessive sun exposure and sunburns by using broad-spectrum sunscreen with a high SPF, wearing protective clothing, and seeking shade during peak sunlight hours.

• Manage stress through relaxation techniques, such as deep breathing, meditation, yoga, or engaging in enjoyable activities.

• Avoid skin trauma, such as cuts, scrapes, or bruises, and take care when using hair dyes or other chemical products that may irritate the skin.

• Maintain a balanced diet rich in fruits, vegetables, whole grains, and lean proteins to support overall skin health and immune function.

• Consider supplementing with vitamin B12, folate, and vitamin D under the guidance of a doctor, especially if deficiencies are suspected or confirmed.

• Attend regular check-ups with a dermatologist to monitor skin health, discuss any concerns, and adjust treatment plans as needed.

• Address any underlying autoimmune conditions or hormonal imbalances in collaboration with relevant medical specialists.

• Educate oneself about vitiligo to better understand the condition, its triggers, and available management options.

While these measures may not completely prevent vitiligo, they can contribute to overall skin health and well-being. If signs of vitiligo do appear, prompt consultation with a dermatologist is essential for timely diagnosis and appropriate treatment.

If you suspect you have vitiligo, your doctor will perform a thorough examination and may recommend certain tests to confirm the diagnosis:

• Physical examination: Your doctor will assess the location, size, and pattern of depigmented patches. They may use a special lamp (Wood's lamp) to highlight areas of pigment loss.

• Medical history review: Discussing your family history, autoimmune conditions, and exposure to potential trigger factors helps guide the diagnosis.

• Skin biopsy: In some cases, a small skin sample may be taken for microscopic examination to rule out other conditions and confirm melanocyte loss.

• Blood tests: Tests for thyroid function, vitamin B12 levels, and other autoimmune disorders may be ordered, as they can co-occur with vitiligo.

• Eye examination: An eye specialist (ophthalmologist) may check for signs of inflammation or other eye problems associated with vitiligo.

There are several approaches to managing and treating vitiligo, with the primary goals being to halt the progression of depigmentation, induce repigmentation, and maintain an even skin tone. The key treatment strategies include:

• Topical medications like corticosteroid creams and immunosuppressants (tacrolimus or pimecrolimus), which can be effective in the early stages, especially for small patches on the face and neck.

• Systemic medications, such as oral or intravenous steroids, may be used in severe or rapidly progressing cases, albeit with caution owing to potential side effects.

• Phototherapy or light therapy, particularly narrow-band UVB, can be highly effective alone or in combination with topical treatments. Multiple sessions per week over several months may be required.

• Excimer laser therapy, using a focused UV light beam, which is well-suited for treating small vitiligo patches while minimising exposure to surrounding healthy skin.

• Surgical options like miniature punch grafting, involving the transfer of pigmented skin to affected areas, are performed as an outpatient procedure under local anaesthesia.

• Depigmentation with monobenzone, a last resort for extensive vitiligo, aiming to remove remaining pigment for a uniform skin tone. This is a permanent and lengthy process.

• Newer therapies, such as the recently FDA-approved topical ruxolitinib cream, showing promise especially for facial vitiligo affecting less than 10% of the body.

Managing vitiligo involves a multifaceted approach that encompasses medical treatments, lifestyle modifications, and emotional support.

• Treatment options may include the use of skin camouflage creams, topical steroid creams, phototherapy, and in some cases, depigmentation or surgical skin grafting.

• Protecting the affected skin from sun exposure by using a high SPF sunscreen is crucial to minimise the risk of sunburn and skin cancer.

• Identifying and avoiding potential triggers, such as stressful events, skin damage, hormonal changes, and exposure to certain chemicals, can help in managing vitiligo flare-ups.

• Seeking support from vitilago organisations and joining support groups can provide valuable emotional support and practical advice for coping with the condition.

If you notice any of the following symptoms, it is essential to consult a doctor:

• Appearance of white patches on your skin, hair, or mucous membranes

• Development of eye inflammation, uveitis, or hearing loss

• Vitiligo is a non-contagious condition that cannot be transmitted to others

• While there is currently no cure for vitiligo, various treatment options are available to manage the symptoms and improve the appearance of the affected skin

• Vitiligo can be associated with other autoimmune disorders, eye problems, sun sensitivity, psychological distress, and potential hearing loss

• Seeking medical advice, protecting the skin from sun exposure, identifying triggers, and obtaining emotional support are essential aspects of living with vitiligo