Granuloma Annulare
Granuloma annulare is a benign, chronic inflammatory skin condition marked by ring-shaped (annular) papules or plaques, usually on the backs of the hands and feet and on the limbs. It is caused by a granulomatous inflammatory reaction surrounding degenerated collagen fibers in the dermis. The condition is harmless and rarely causes strong symptoms such as pain or severe itch, but its typical ring shape is often mistaken for a fungal infection and can be a cosmetic concern.
At Haute-Derma, treatment of granuloma annulare aims to calm the immune reaction in the dermis and restore the damaged collagen structure.
How Granuloma Annulare Is Diagnosed
At Haute-Derma, diagnosis relies on assessing the dermal structure to pinpoint the exact clinical type:
- Clinical examination: we look for firm, skin-colored or pale pink papules arranged in a ring with a slightly depressed or flat center.
- Dermoscopy: shows linear or comma-shaped vessels around a pale yellow or cloudy white center that corresponds to the area of degenerated collagen.
- Skin biopsy: the gold standard. It shows foci of degenerated collagen (necrobiosis) with mucin deposition (two distinct findings that typically occur together), surrounded by lymphocytes and macrophages arranged in a palisade (palisading granuloma).
- Systemic screening tests: blood sugar and thyroid function are checked, because granuloma annulare (especially the generalized form) is statistically linked to diabetes and thyroid disease.
- Differential diagnosis: we rule out ringworm of the body (tinea corporis), annular lichen planus and erythema annulare centrifugum.
Modern Treatment of Granuloma Annulare at Haute-Derma
Granuloma annulare can clear on its own, but for cosmetically troubling or widespread cases we use:
- Intralesional corticosteroid injections: the most effective option for localized disease, delivering anti-inflammatory medication directly into the affected collagen so the bumps flatten quickly.
- Phototherapy (NB-UVB/PUVA): particularly effective for generalized disease, calming the immune response and fading large red patches.
- Topical calcineurin inhibitors: suitable for long-term use to keep the condition stable without thinning the skin.
- Cryotherapy: liquid nitrogen is applied to small, localized papules to stimulate tissue renewal.
- Systemic medication: in resistant cases, the doctor may consider hydroxychloroquine or isotretinoin to control the granulomatous reaction from within.
