Lentigines: Understanding, Diagnosing, and Managing Brown Skin Lesions

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Lentigines are pigmented skin lesions that present as flat or slightly raised brown marks with well-defined edges. They are distinct from typical freckles by their darker pigmentation, broader distribution, and persistence even in the absence of sun exposure. Lentigines are prevalent and come in various types, each with unique characteristics.

Causes of Lentigines

The development of lentigines is primarily attributed to ultraviolet (UV) light exposure from the sun, tanning beds, or phototherapy. Certain genetic conditions can also predispose individuals, particularly children, to the formation of multiple lentigines.

Varieties and Characteristics of Lentigines

Lentigines are categorized based on their appearance, location, cause, and any associated conditions. Most types are stable in adults and do not change or vanish over time.

Simple Lentigo (Lentigo Simplex): Common in children, these lentigines are not linked to sun exposure and often appear on the trunk and limbs, measuring 5 to 15mm in diameter.

Solar Lentigo: Tied to sun exposure, these benign lesions typically appear on sun-exposed areas such as the hands, face, and lower legs. They are usually under 5mm in diameter, may coalesce to form larger spots, and can vary in color from yellow to brown to black, sometimes disappearing over time.

Diagnosis of Lentigines

Diagnosis is typically made by observing the lesion's clinical appearance. A dermatoscope, a device using polarized magnification, may be used for closer examination. If uncertainty exists regarding the diagnosis or the lesion presents unusually, a biopsy may be recommended, involving the removal and pathological analysis of a skin sample under local anesthesia.

Treatment Options for Lentigines

Lentigines are generally not treated unless diagnostic uncertainty exists or the lesion's appearance is atypical. Common treatment methods include:

Cryotherapy: Freezing the lesion with liquid nitrogen.

Curettage and Cautery: Gently scraping the lesion away under local anesthesia.

Intense Pulsed Light (IPL) Therapy: Using focused light pulses to treat the lesion.

Sun Protection: Applying SPF 50+ broad-spectrum sunscreen to prevent new lentigines.

Preventing Lentigines

Prevention of UV-induced lentigines involves rigorous sun protection measures, with clothing proving more effective than sunscreens.

Prognosis for Lentigines

Lentigines are persistent and may increase with age and sun exposure. Some may fade and disappear, particularly in areas protected from the sun.

Monitoring for Changes

It is essential to monitor for any changes in size, shape, color, or symptoms such as bleeding, especially in lentigines with irregular or dark colors and shapes. Consult your GP for any concerning changes, as some lentigines can evolve into lentigo maligna, a precancerous skin condition.

In summary, while lentigines are generally benign, it is important to be vigilant for changes that may indicate a more serious condition. By practicing sun safety and seeking medical advice when necessary, you can ensure the health of your skin.