Lentigo Simplex (Skin Disease Type)

Lentigo Simplex 

These lesions occur on sun-exposed skin, especially face, arms, and hands. Lesions are flat, and pigmented in shades of brown, with characteristically sharp borders. They tend to fade with sun avoidance.

Clinical Features 

Lentigo simplex lesions may occur anywhere on the skin or mucous membranes. Only a few lesions may develop initially, but over time up until adult life they may become more numerous. Rarely, lesions may erupt suddenly or occur in vast numbers. Lesions appear as:

• ·         Round or oval shaped macule (flat spot or patch) 3-15mm in diameter
• ·         Margin or edge of the macule can be jagged or smooth
• ·         A single even colour ranging from light brown to black
• ·         Lesions are symptomless, i.e.: not painful or itchy

Lentigo simplex lesions are distinguished from freckles by their darker colour, comparative sparseness and scattered distribution. They also do not darken or increase in number on sun exposure, as do freckles.

Causes

The cause of lentigo simplex is unknown. Multiple lentigines can occur without associated conditions, in which case the condition is referred to as lentigines profusa or generalised lentigines. When multiple lentigines occur with associated abnormalities, the condition forms its own disease entity. These include Peutz-Jeghers syndrome, Xeroderma pigmentosum, LAMB syndrome, LEOPARD syndrome and Carney's complex.

Treatments

 Lentigo simplex lesions are benign (non-cancerous) lesions that cause no harm. However, their appearance is sometimes similar to melanomas or other cancerous lesions so they need to be examined carefully. Also, the presence or development of multiple lentigines may indicate the presence of associated abnormalities. Sometimes these defects may not show up clinically for many years, so a patient with lentigines should be followed up for long periods.

In some patients, the lesions may fade or disappear spontaneously over the course of years. If necessary, lentigines can be removed permanently through the use of chemical peels, cryotherapy, laser treatments or simple surgical excision.

Source By dermnetnz