Black Hair with White Streak: Exploring the Meaning of Poliosis

A striking contrast of dark hair punctuated by a stark white streak can be a captivating and sometimes intriguing feature. This phenomenon, known as poliosis, has a variety of causes and implications. This article delves into the world of poliosis, exploring its causes, associated conditions, and the cultural significance that has evolved around it.

What is Poliosis?

Poliosis, also called poliosis circumscripta, is characterized by a localized patch of white or depigmented hair amidst normally colored hair. This can occur on any hair-bearing area of the body, including the scalp (often referred to as a white forelock or Mallen streak), eyebrows, eyelashes, beard, or chest. The hypopigmented hair lacks melanin, the pigment responsible for hair and skin color. Poliosis affects your hair, and can occur in both adults and children.

Causes of Poliosis

Poliosis arises from a deficiency or absence of melanin and melanocytes (the cells that produce melanin) in the affected hair follicles. There are two main categories of poliosis: genetic and acquired.

Genetic Poliosis

Genetic poliosis is often linked to inherited genetic mutations or syndromes. Some of the associated genetic conditions include:

• Piebaldism: This rare genetic disorder, affecting approximately 1 in 20,000 people, is characterized by a congenital absence of melanocytes in certain areas of the skin and hair, leading to white patches or a white forelock, sometimes accompanied by a depigmented swathe on the center of the frontal hair and sometimes forehead skin.
• Waardenburg Syndrome: This group of congenital conditions, affecting approximately 1 in 42,000 people, can cause hearing loss, severe constipation, joint problems, and pigmentary anomalies, including hair poliosis, and white patches of skin.
• Tuberous Sclerosis Complex (TSC): TSC is a genetic condition, experienced by 2 million people worldwide, that leads to the formation of benign tumors in multiple organs, patches of white skin, seizures, intellectual disabilities, and other problems.

Acquired Poliosis

Acquired poliosis develops later in life and can be triggered by various factors, including:

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• Autoimmune Conditions: Autoimmune disorders, such as vitiligo and alopecia areata, can sometimes cause poliosis. Vitiligo, in particular, is accompanied by hair poliosis in 25% of cases.
• Eye Conditions: Certain eye diseases like blepharitis (clogged oil glands that cause eyelid swelling), sympathetic ophthalmia (inflammation in your eye after injury or surgery), and Vogt-Koyanagi-Harada disease (a rare condition where your immune system attacks your pigment cells and affects your eyes, ears, nervous system, and skin) have been associated with acquired poliosis.
• Infections: Shingles, a rash caused by a reactivated varicella-zoster virus or chicken pox virus, can sometimes lead to poliosis.
• Medications and Treatments: Certain treatments, like radiation and eye medications (Topical prostaglandin F(2alpha) analog), have been reported to induce poliosis.
• Neoplasms: Poliosis has been associated with melanocytic lesions such as congenital or acquired nevi and melanoma.
• Alopecia areata: this is an autoimmune type of alopecia. It usually manifests with smooth, round, bald patches on the scalp, though hair often grows back spontaneously. Early hair regrowth can manifest with poliosis that eventually resolves. White or discoloured patches that grow, resolve, then regrow in another area (known as migratory poliosis) have also been associated with this condition. One study identified poliosis in 5% of alopecia areata patients.
• Neurofibroma: these non-cancerous tumours form under the skin, along the nerves.

Symptoms and Diagnosis

The primary symptom of poliosis is the presence of a white or discolored streak or patch of hair. This can manifest on the head, eyebrows, eyelashes, arms, and surrounding skin. Depending on the underlying cause, other symptoms may be present. These can include blurry vision, eye inflammation, hair loss, patches of white skin, pressure buildup in your eye, skin and organ growths, hearing loss, and neurological problems.

A doctor can typically diagnose poliosis by visual examination. To determine the underlying cause, they may conduct further tests, such as an eye exam, skin examination under a Wood's lamp, blood tests, or a skin biopsy. They will also ask for your medical history, as well as that of your close biological relatives, to determine if the condition is genetic or acquired If it is genetic, they will ask about any other accompanying symptoms, to identify its nature. If your condition is acquired, they will carefully check the affected area for lesions, infections, skin discolouration or signs of immune activity that may accompany poliosis. They will map these findings to any additional symptoms you have described.

Treatment Options

Currently, there is no definitive cure for poliosis, especially in genetic cases. However, if the poliosis is acquired, it will often regrow in your natural hair colour after the underlying cause has been resolved. For example, one study published in 2013 revealed that 1-2 months of phototherapy led to the re-colouring of hair follicles in patients with vitiligo-induced poliosis. When it comes to other autoimmune conditions, such as alopecia areata, repigmentation may occur after treatments that reduce inflammation in the affected area. Scientists are also testing new treatments that can stimulate hair repigmentation under inflammatory conditions.

If an underlying condition is identified, treatment will focus on managing that condition. For example, steroid creams and light therapy might be used for vitiligo, although these may not prevent the spread of white patches.

For those bothered by the appearance of the white streak, cosmetic options like hair dye, hats, headscarves, bandanas, or wigs can be used to conceal it. Support groups can also provide a valuable resource for individuals struggling to adjust to poliosis and related conditions.

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Poliosis and Cultural Significance

Throughout history, a white streak in the hair has carried various cultural connotations. The term "Mallen streak" originates from Catherine Cookson's novels, where the Mallen family had a hereditary white streak.

In medieval times, a white streak, then known as a "Witch's Streak," was considered a sign of witchcraft. The Mallen streak has become the ultimate symbol of alt beauty: communicating glamour, danger and deviance.

Today, the Mallen streak has become a symbol of alt beauty and is now associated with divergent, anomalous, or maligned personalities, a birthmark that points to witchcraft and transgression.

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