Patch-type granuloma annulare

Patch-type granuloma annulare
Synonyms
Pronounce	N/A
Specialty	N/A
Symptoms	Skin lesions, rash
Complications
Onset
Duration
Types	N/A
Causes	Unknown
Risks
Diagnosis	Clinical diagnosis, skin biopsy
Differential diagnosis	Tinea corporis, Erythema annulare centrifugum, Necrobiosis lipoidica
Prevention
Treatment	Topical corticosteroids, cryotherapy, phototherapy
Medication
Prognosis	Generally good
Frequency	Rare
Deaths	N/A

Patch-type granuloma annulare is a skin condition characterized by red or skin-colored patches that are typically found on the extremities, trunk, or face. It is a rare variant of granuloma annulare, a chronic skin condition that causes raised, reddish or skin-colored bumps (lesions) in a ring pattern, usually on the hands and feet.

Signs and Symptoms

Patch-type granuloma annulare typically presents as asymptomatic, annular, or arcuate plaques. The plaques are usually skin-colored to erythematous and are most commonly located on the extremities, trunk, or face. The condition is often mistaken for tinea corporis or eczema due to its similar appearance.

Causes

The exact cause of patch-type granuloma annulare is unknown. However, it is believed to be an immune response to a variety of triggers, such as infections, minor injuries, or insect bites. Some studies suggest a possible association with diabetes mellitus, but this link is not well established.

Diagnosis

Diagnosis of patch-type granuloma annulare is typically made based on the clinical appearance of the skin lesions. A skin biopsy may be performed to confirm the diagnosis. The histologic findings are similar to those of other forms of granuloma annulare, with the presence of palisaded granulomas and collagen degeneration.

Treatment

Treatment for patch-type granuloma annulare is often unnecessary as the condition is usually self-limiting and resolves without treatment. However, in some cases, treatment may be recommended to improve the appearance of the skin lesions. Treatment options include topical corticosteroids, light therapy, and oral medications.

See Also

• Granuloma annulare
• Dermatology
• Skin biopsy