Lichen striatus

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Lichen striatus
Synonyms	Linear lichenoid dermatosis
Pronounce	N/A
Specialty	Dermatology
Symptoms	Linear rash, itching
Complications	N/A
Onset	Typically in childhood
Duration	Usually self-limiting
Types	N/A
Causes	Unknown, possibly autoimmune
Risks	More common in children
Diagnosis	Clinical diagnosis, skin biopsy
Differential diagnosis	Linear epidermal nevus, linear psoriasis, lichen planus
Prevention	N/A
Treatment	Usually none required, topical corticosteroids if needed
Medication	Topical corticosteroids
Prognosis	Excellent, usually resolves spontaneously
Frequency	Rare
Deaths	N/A

Lichen striatus is a rare, benign skin condition that typically affects children. It is characterized by the sudden onset of linearly arranged, small, flat-topped, flesh-colored or pinkish papules. The condition is self-limiting and usually resolves without treatment within a year.

Etiology

The exact cause of lichen striatus is unknown. However, it is believed to be an inflammatory response to an unknown trigger. Some researchers suggest that it may be related to a viral infection or an autoimmune response. Viral infections and autoimmune responses are both known to cause inflammation in the body.

Clinical Presentation

Lichen striatus typically presents as a linear band of small, flat-topped, flesh-colored or pinkish papules. The band usually starts at one end of the body and progresses to the other end over a period of weeks. The most common sites of involvement are the limbs, especially the legs. The rash is usually asymptomatic, but some patients may experience mild itching.

Diagnosis

The diagnosis of lichen striatus is primarily based on the characteristic clinical presentation. A skin biopsy may be performed to confirm the diagnosis. The histopathological findings typically show a lichenoid tissue reaction with a band-like infiltrate of lymphocytes in the upper dermis.

Treatment

Lichen striatus is a self-limiting condition that usually resolves without treatment within a year. However, topical corticosteroids may be used to alleviate any associated itching. In some cases, the condition may recur.

Prognosis

The prognosis for lichen striatus is excellent. The condition is benign and does not cause any long-term health problems. However, it may cause temporary discoloration of the skin, which usually fades over time.

See Also

• Lichen planus
• Lichen nitidus
• Lichen sclerosus