[Granuloma annulare].

Area of Science:

• Dermatology
• Immunology
• Pathology

Context:

• Granuloma annulare (GA) is a benign, chronic inflammatory skin disease with uncertain pathogenesis.
• Potential triggers like infections and associations with systemic conditions such as cancer and diabetes mellitus are reported but unverified.
• Clinical presentations vary from localized to disseminated, subcutaneous, or perforating forms.

Purpose:

• To provide a comprehensive overview of granuloma annulare, including its pathogenesis, clinical manifestations, diagnosis, and treatment.
• To discuss the diagnostic criteria, emphasizing histological findings of necrobiotic granulomatous inflammation.
• To review current therapeutic strategies, considering the disease's benign nature and potential treatment side effects.

Summary:

• Diagnosis relies on clinical presentation, potentially confirmed by biopsy showing characteristic necrobiotic granulomatous inflammation.
• Prognosis is generally good, with frequent spontaneous resolution in localized forms; disseminated forms may be persistent and recurrent.
• Treatment options range from topical corticosteroids for localized disease to systemic therapies including corticosteroids, dapsone, hydroxychloroquine, retinoids, fumaric acid, cyclosporine, and anti-TNFα for disseminated forms.

Impact:

• Informs clinicians on the diagnosis and management of granuloma annulare, aiding in patient counseling regarding prognosis and treatment choices.
• Highlights the need for further research into the pathogenesis and verified associations with systemic diseases.
• Supports evidence-based decision-making for selecting appropriate therapies based on disease severity and patient factors.