Introduction

Lichen nitidus is a rare, chronic inflammatory skin condition that is often identifiable by the appearance of very small, flesh-coloured or hypopigmented papules. While it can often be asymptomatic and typically self-limiting in most people, some people (of all ages) may experience discomfort. 

They can also experience excessive itching, which can lead to emotional distress, especially when the lesions are extensive or involve sensitive areas. Although the condition is non-threatening and often resolves on its own without lasting effects, cases that show symptoms may require treatment to ease discomfort and enhance quality of life. In this article, we will delve into the treatments and how to manage symptomatic lichen nitidus.^1,2

Clinical presentation

Lichen nitidus is typically presented as clusters of very shiny, flat-topped papules that are usually 1-2mm in diameter. In their appearance, they are typically:

• Flesh-coloured
• Hypopigmented
• Occasionally, slightly erythematous

These papules typically manifest on the trunk, limbs, abdomen, and genital areas. They often present in clearly defined patches and are usually without symptoms. However, when there is more extensive involvement or in cases of palmoplantar psoriasis (affecting the hands and feet), itching can become considerable, leading to a need for medical evaluation.

In children, the disease is often presented with more widespread or generalised distribution, whereas in adults, the lesions are often localised. Both age groups experience the Koebner phenomenon, which is when the appearance of new lesions at the site of trauma is frequently observed and can contribute to the further spread of lesions, especially in active or physically mobile individuals.^3,4

Diagnostic considerations

Diagnosis of symptomatic lichen nitidus is largely clinical and based on characteristic appearance and the distribution of lesions. In the more typical cases, there is no need for further investigations. However, in persistent or extensive cases, confirmation is needed and can be done through a skin biopsy.

Histopathological examination typically shows a dense, well-defined lymphohistiocytic inflammation that surrounds and obscures the dermal papillae. This pattern is known as the classic ‘ball and claw’ appearance, which is crucial for distinguishing lichen nitidus from other common skin conditions such as papular eczema.^5,6

Indications for treatment

Most cases of lichen nitidus are often self-limiting, resolving within a few months to a few years. Which means that treatment is not always necessary, but therapeutic intervention is needed in cases where:

• Lesions are symptomatic, such as pruritic (itching) or painful
• There is a significant cosmetic concern that impacts psychosocial well-being
• Lesions can involve sensitive areas such as the genitalia or face
• The disease becomes generalised and persistent or progressive

Treatments can include symptom relief, reducing the visible lesions and overall improving the patient’s quality of life.^1,7

First-line treatment options

Topical corticosteroids

Mild to moderate potency corticosteroids (eg hydrocortisone, triamcinolone) are often the first-line treatment, especially for localised disease. They work by reducing inflammation and itching, but due to their potency, they must be used in short courses. By limiting the use, side effects such as skin thinning or striae, especially in children or when applied to sensitive areas like the face or groin, can be avoided.^1,8

Tropical calcineurin inhibitors (TCIs)

In sensitive areas like the face or genital, or for long-term use, tacrolimus or pimecrolimus are very effective alternatives. These non-steroidal agents typically work by inhibiting T-cell activation and therefore modulating the immune response without causing atrophy. Thus, they are very valuable in paediatric patients and for facial or genital involvement where the use of corticosteroids should be limited.^1,9

Second-line therapies

Phototherapy

Narrowband Ultraviolet B (NB-UVB) phototherapy has proven to be highly effective in treating generalised cases or when other treatments have been unsuccessful in children because of its relatively favourable safety profile. However, for its success, multiple sessions over a longer period are usually needed.¹⁰

Systemic corticosteroids

Used for severe and widespread cases where the use of short-term corticosteroids can rapidly reduce inflammation but carry risks such as immunosuppression, mood changes and growth suppression in pediatric patients. However, use has to be limited and carefully monitored.¹¹

Antihistamines

Non-sedating antihistamines can be used in addition to other treatments to provide extra relief from itching. They are especially effective when scratching interferes with sleep or daily routines.¹²

Emerging and adjunct therapies

Acitretin

Acitretin is an oral retinoid that has been reported to improve extensive lichen nitidus lesions, especially in adults. However, its use has to be limited because its side effect profile can be problematic.¹³

 Methotrexate

Low-dose methotrexate has been used in rare, stubborn cases. Close monitoring for hepatotoxicity and bone marrow suppression is necessary, which makes it only suitable for severe adult cases.^1,14

Paediatric considerations

Treatments aimed at children must prioritise their safety as well as any long-term effects. Topical therapies are favoured due to their localised action and with that lower risk profiles. 

Phototherapy, for example, is a well-tolerated option for widespread disease but may also be logistically challenging. Systemic therapies are rarely indicated and therefore should only be considered under specialist supervision.^5,6

Psychological and social support

Children and adults with visible skin lesions may feel mental distress, including low self-esteem or social withdrawal. So by getting counselling, attending peer support groups, or cognitive-behavioural therapy (CBT) can significantly improve quality of life and help learn coping skills.

Lifestyle and supportive measures

• Moisturisers: regular application can help with soothing irritated skin and restore barrier function
• Avoiding irritants: fragrance-free soaps, detergents, and emollients can reduce flare-ups
• Sun creams: while mild sun exposure can help but excessive and prolonged exposure can irritate or trigger Koebnerization (Koebner Phenomenon)
• Loose clothing: helps minimise friction, especially in areas likely to become sore or damaged, such as the thigh, as well as the waistline

Prognosis and monitoring

Lichen nitidus typically follows a benign course, which can be resolved over months to years. However, recurrences can happen at any time, so it is important to have regular follow-up to ensure that treatments remain appropriate. This allows for any side effects to be minimised and addressed efficiently, and any new or concerning symptoms are promptly addressed.^1,15

Summary

Lichen nitidus is a rare skin condition that causes small, flesh-colored or lighter papules on the skin. While it is often without symptoms and usually resolves by itself, some individuals may suffer from discomfort or itching, especially in sensitive areas.

This condition is typically harmless but may require treatment to relieve discomfort and improve quality of life in symptomatic cases. The skin manifestations of lichen nitidus appear as shiny, flat-topped papules, usually measuring between 1-2 mm in diameter. They are most commonly found on the trunk, limbs, abdomen, and genital areas. In children, the lesions may be more widespread, while in adults, they are often localised. Both age groups may experience the Koebner phenomenon, where new lesions arise at sites of skin injury.

Diagnosis is primarily clinical, relying on the characteristic look and distribution of the lesions. Further investigations, like a skin biopsy, may be needed for persistent cases. The biopsy can show inflammation patterns typical of lichen nitidus, differentiating it from other skin issues. Most cases do not require treatment, as they typically resolve within months to years.

However, treatment is considered necessary when lesions are symptomatic, cause cosmetic concerns, affect sensitive areas, or if the condition becomes widespread. The first-line treatments for lichen nitidus often include topical corticosteroids, which reduce inflammation and itching but should be used sparingly to avoid side effects. For sensitive areas, topical calcineurin inhibitors provide effective alternatives without the risk of skin thinning.

For second-line therapies, narrowband ultraviolet B phototherapy can be effective for more severe cases, though multiple sessions may be required. Systemic corticosteroids may be used in severe cases but need careful monitoring due to potential side effects. Antihistamines can help relieve itching, especially for individuals whose sleep or daily activities are impacted. Emerging treatments include oral retinoids like acitretin, which may benefit extensive lesions, and low-dose methotrexate for stubborn cases, though these require careful monitoring.

For children, treatment approaches must prioritise safety, often favouring topical therapies. Psychological support is also important, as visible skin conditions can lead to emotional distress, impacting self-esteem. Support measures like moisturisers, avoidance of irritants, sun protection, and loose clothing can help manage symptoms and prevent flare-ups. Overall, lichen nitidus usually resolves on its own but can recur, necessitating regular follow-ups to manage symptoms and treatment effectively.