Riehl melanosis

Riehl melanosis
Synonyms	Pigmented contact dermatitis
Pronounce	N/A
Specialty	N/A
Symptoms	Hyperpigmentation of the face and neck
Complications	Psychosocial impact due to cosmetic concerns
Onset	Gradual
Duration	Chronic
Types	N/A
Causes	Contact dermatitis, Photosensitivity, Cosmetic use
Risks	Use of certain cosmetics, sun exposure
Diagnosis	Clinical diagnosis, Patch testing
Differential diagnosis	Melasma, Post-inflammatory hyperpigmentation, Lichen planus pigmentosus
Prevention	Avoidance of triggering substances, sun protection
Treatment	Topical corticosteroids, Hydroquinone, Sunscreen
Medication	N/A
Prognosis	Variable, often chronic
Frequency	Rare
Deaths	N/A

Riehl melanosis is a type of melanosis that was first described by the German dermatologist Heinrich Riehl in 1917. It is characterized by hyperpigmentation of the skin, particularly in the face and neck area. The condition is often associated with exposure to certain chemicals or substances, such as fragrances or cosmetics, which can cause an allergic reaction leading to the hyperpigmentation.

Causes

The exact cause of Riehl melanosis is not fully understood. However, it is believed to be a type of contact dermatitis, caused by an allergic reaction to certain substances. These can include fragrances, cosmetics, and even certain types of food. The reaction causes inflammation in the skin, which can lead to the overproduction of melanin, resulting in hyperpigmentation.

Symptoms

The primary symptom of Riehl melanosis is hyperpigmentation of the skin, particularly in the face and neck area. The skin may appear darker and may have a grey or brown hue. In some cases, the skin may also become rough or scaly.

Diagnosis

Diagnosis of Riehl melanosis is typically made through a physical examination of the skin. A dermatologist may also perform a skin biopsy to confirm the diagnosis and rule out other conditions.

Treatment

Treatment for Riehl melanosis typically involves avoiding the substances that are causing the allergic reaction. This may involve changing cosmetics or avoiding certain foods. In some cases, topical creams or ointments may be prescribed to help lighten the skin.

See also

• Melanosis
• Contact dermatitis
• Skin biopsy