Riehl

Riehl melanosis is a type of pigmentation disorder that primarily affects individuals of Asian descent. It is characterized by hyperpigmentation of the skin, particularly in areas exposed to the sun. The condition was first described by the German dermatologist Nikolaus Riehl in 1917.

Symptoms and signs

The primary symptom of Riehl melanosis is hyperpigmentation of the skin. This typically presents as dark, irregular patches on the face, neck, and upper body. The pigmentation is often uneven and may have a rough texture. Some individuals may also experience mild itching or discomfort in the affected areas.

Causes

The exact cause of Riehl melanosis is unknown. However, it is believed to be related to exposure to certain environmental factors, such as sunlight and chemicals found in cosmetics and skincare products. Some studies suggest that the condition may also have a genetic component.

Diagnosis

Diagnosis of Riehl melanosis is typically made based on the characteristic appearance of the skin. A dermatologist may also perform a skin biopsy to confirm the diagnosis and rule out other conditions that can cause similar symptoms, such as melasma or post-inflammatory hyperpigmentation.

Treatment

Treatment for Riehl melanosis primarily involves avoiding the environmental factors that can trigger or worsen the condition. This may include using sun protection and avoiding certain cosmetics and skincare products. In some cases, topical treatments or laser therapy may be used to lighten the hyperpigmentation.

See also

• List of cutaneous conditions
• Melanin
• Hyperpigmentation

References

Riehl Resources
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