Granuloma Annulare: How to Recognize It, Distinguish It from Ringworm, and Treat It

June 1st, 2026

Key takeaways

• Granuloma annulare (GA) is a benign, usually noninfectious inflammatory dermatosis that most often presents as smooth, nonscaly, annular papules or plaques on the dorsal hands, feet, wrists, or ankles. Localized disease commonly resolves spontaneously, while generalized disease is more persistent and often harder to treat.  
• GA commonly is mistaken for ringworm (tinea corporis) because both can be ring-shaped. The most useful bedside distinction is scale: GA typically is smooth and nonscaly, whereas tinea corporis usually has a raised, scaly advancing border and pruritus.  
• The cause of GA remains incompletely defined. Current evidence supports an immune-mediated granulomatous reaction pattern, with proposed triggers including trauma, medications, and, less consistently, systemic disease and infections.  
• Reported viral associations include human immunodeficiency virus (HIV), Epstein-Barr virus, and varicella zoster virus. These should be viewed as possible triggers or associations rather than established direct causes in most patients.  
• Treatment depends on subtype, symptoms, and disease burden. Observation is appropriate for many localized cases. When therapy is needed, topical or intralesional corticosteroids are standard first-line options. Generalized or refractory disease may require phototherapy or systemic therapy, often with dermatology input.  

Defining granuloma annulare

GA is a cutaneous granulomatous inflammatory disorder characterized clinically by skin-colored to erythematous papules that often coalesce into annular plaques. It is considered benign and noncontagious. In many patients it is self-limited. Histologically, GA is classically associated with palisading or interstitial granulomatous inflammation and altered collagen in the dermis.  

The term granuloma refers to a granulomatous inflammatory pattern, while annulare reflects the ring-like arrangement of lesions. Despite the name, GA is not an infection, and it is not related to dermatophyte infection unless a separate process is present.  

What causes granuloma annulare?

The short answer is that no single cause has been confirmed. GA is best understood as a reaction pattern rather than a disease with one established etiology. Contemporary reviews support an immune-mediated process involving macrophages, T-cell signaling, and cytokine pathways that contribute to granuloma formation and dermal collagen alteration.  

Proposed triggers include minor trauma, insect bites, sun exposure, medications, and infections. Reported disease associations include diabetes, dyslipidemia, thyroid disease, and, in some studies, hematologic malignancy, but the literature is mixed and does not support routine broad laboratory screening in every patient with otherwise typical localized GA. A targeted workup is more appropriate when the history, morphology, or distribution is atypical, or when generalized disease is present.  

Clinically, that means GA should prompt pattern recognition first, not reflexive overtesting. For many patients with classic localized lesions and no systemic clues, reassurance and observation are reasonable.  

What viral infections cause granuloma annulare?

Viral infections do not appear to “cause” GA in a uniform, deterministic way. Instead, the literature describes viral associations and possible triggers. The best-described viral associations are HIV, Epstein-Barr virus, and varicella zoster virus. Case-based and review-level literature also has discussed hepatitis viruses and, more recently, SARS-CoV-2-related eruptions or vaccination-associated cases, but those data are limited and do not establish causality.  

Among these, HIV is the association clinicians are most likely to act on, especially when GA is generalized, atypical, treatment-resistant, or accompanied by other risk factors or suggestive history. In contrast, Epstein-Barr virus and varicella zoster virus are better viewed as reported triggers than routine screening targets in otherwise typical cases.  

What does granuloma annulare look like?

Localized GA, the most common subtype, usually presents as skin-colored, pink, or erythematous papules arranged in annular plaques with central clearing. The border often is firm or “rope-like,” but the surface is smooth and notably lacks scale. Lesions favor the dorsal hands, fingers, feet, ankles, and wrists. Symptoms usually are absent or mild, although some patients report tenderness or pruritus.  

Generalized GA presents differently: patients develop multiple papules or annular plaques across the trunk and extremities, and the eruption tends to be more persistent. Less common variants include subcutaneous GA, seen more often in children; perforating GA, with umbilicated or crusted papules; and patch-type GA, which can be especially misleading diagnostically.  

For clinicians, the most helpful morphologic clue is the absence of scale in a ring-shaped lesion. That single observation often narrows the differential substantially.  

Granuloma annulare vs. tinea corporis

This is the comparison patients (and often clinicians) care about most. Both conditions can form rings with central clearing, but the underlying processes differ completely.

GA is an inflammatory, noninfectious dermatosis. Tinea corporis is a dermatophyte infection caused by fungi. Tinea corporis usually ispruritic and scaly, often with an active advancing border. GA usually is smooth, less symptomatic, and classically located on dorsal acral sites.  

When uncertainty remains, bedside testing helps. A potassium hydroxide (KOH)  preparation or fungal culture from the scaly edge can confirm tinea corporis, whereas a skin biopsy can confirm GA when the presentation is atypical or when other inflammatory or granulomatous conditions remain in the differential.  

Comparison matrix for granuloma annulare and similar-appearing conditions 

Condition	Typical appearance	Scale	Symptoms	Common distribution	Key diagnostic clues	Initial management
Granuloma annulare	Smooth, skin-colored to erythematous papules forming annular plaques with central clearing	Usually absent	Often asymptomatic; sometimes mild itch or tenderness	Dorsal hands, feet, ankles, wrists; generalized form on trunk/extremities	Firm papular border, no scale, often self-limited; biopsy if atypical	Observe if localized and asymptomatic; topical or intralesional corticosteroids if treatment desired
Tinea corporis (ringworm)	Annular erythematous plaque with advancing raised border and central clearing	Present, especially at edge	Itch common	Any glabrous skin; often asymmetric	Peripheral scale, exposure history, positive potassium hydroxide (KOH) from active border	Topical antifungal for limited disease; oral therapy for extensive or refractory disease
Nummular eczema	Coin-shaped erythematous plaques, often less sharply annular than tinea	Usually present	Often intensely pruritic	Extremities, trunk	Eczematous surface, xerosis, oozing or crusting possible; KOH negative	Emollients, trigger avoidance, topical corticosteroids
Pityriasis rosea	Oval or annular salmon-colored lesions, often with herald patch	Fine collarette scale	Often mild itch or asymptomatic	Trunk along cleavage lines	“Christmas tree” distribution, trailing collarette scale	Symptomatic treatment; self-limited
Erythema annulare centrifugum	Annular, arciform, or polycyclic erythematous lesions	Characteristic trailing scale	Variable itch	Trunk, thighs, legs	Delicate scale behind advancing edge rather than absent scale	Treat trigger if found; symptomatic anti-inflammatory therapy
Plaque psoriasis	Well-demarcated erythematous plaques; may be annular	Thick silvery scale	Variable itch	Extensor surfaces, scalp, sacrum	Chronic plaques, nail changes, family history	Topical steroids/vitamin D analogs; escalate by severity
Erythema migrans	Expanding annular erythematous patch or plaque	Usually absent	May have systemic symptoms	Tick-exposed sites	Exposure history, expanding lesion after tick bite, flu-like prodrome	Treat empirically for Lyme disease when clinically indicated
Subacute cutaneous lupus erythematosus	Annular or polycyclic erythematous plaques, often photosensitive	Often minimal to fine scale	Variable photosensitivity	Sun-exposed areas	Photosensitive distribution, serology/biopsy support diagnosis	Photoprotection, topical therapy, rheumatologic/dermatologic evaluation as needed

How granuloma annulare is diagnosed

Diagnosis often is clinical in classic localized cases. When lesions are smooth, annular, acral, and asymptomatic, many dermatologists can diagnose GA from the morphology and distribution alone.  

Biopsy becomes useful when lesions are scaly, widespread, treatment-resistant, ulcerated, or clinically inconsistent with classic GA. It  also is appropriate when the differential includes tinea, sarcoidosis, necrobiosis lipoidica, cutaneous lupus, or other granulomatous disorders.  

If tinea corporis is in the differential, a KOH preparation from the active edge is a high-yield step before escalating anti-inflammatory therapy. Missing dermatophyte infection and treating it empirically with corticosteroids can obscure the diagnosis.  

Treatment of granuloma annulare

Treatment is guided by extent, symptoms, cosmetic burden, and patient preference. Because localized GA often resolves spontaneously within months to a few years, observation and reassurance are appropriate for many patients.  

For localized lesions that warrant therapy, high-potency topical corticosteroids, often under occlusion, and intralesional corticosteroids are standard first-line treatments. Cryotherapy also has been used in selected localized lesions.  

Generalized GA is more challenging. The evidence base is limited, and most therapies are supported by case series, retrospective studies, or systematic reviews of heterogeneous data rather than large, randomized trials. Phototherapy remains one of the better-supported options for generalized disease. Other reported treatments include hydroxychloroquine, dapsone, retinoids, methotrexate, apremilast, pentoxifylline, and biologic or Janus kinase (JAK)-pathway agents in refractory cases, but treatment selection should be individualized and usually coordinated with dermatology.  

A practical approach is straightforward: Observe limited asymptomatic disease, inject or topically treat focal bothersome plaques, and reserve systemic therapy for generalized, chronic, or quality-of-life-limiting disease.  

Prognosis

Localized GA often resolves spontaneously, although recurrence can occur. Generalized GA is more likely to follow a chronic or relapsing course and may persist for years. Importantly, even persistent disease  usually is benign from a systemic standpoint, although it can be frustrating cosmetically and therapeutically. 

FAQ

Is granuloma annulare contagious?

No. Granuloma annulare (GA) is not contagious and is not caused by a fungus in the way ringworm (tinea corporis) is.  

How can you tell GA from tinea corporis?

The most useful clue is scale. GA  usually is smooth and nonscaly. Tinea corporis usually has a scaly, raised border and is more likely to itch. A potassium hydroxide (KOH) preparation helps when the diagnosis is uncertain.  

What causes GA?

No single cause has been established. It is thought to represent an immune-mediated granulomatous reaction that may be triggered by trauma, medications, or infections in some patients.  

What viral infections are associated with GA?

Reported associations include human immunodeficiency virus, Epstein-Barr virus, and varicella zoster virus. These are best considered possible triggers or associations, not definitive causes in most cases.  

Does GA need treatment?

Not always. Many localized cases are asymptomatic and self-limited, so observation is reasonable. Treatment typically is pursued for symptomatic, cosmetically bothersome, generalized, or persistent disease.  

What is first-line therapy?

For localized disease, topical corticosteroids and intralesional corticosteroids are common first-line options.  

When should clinicians consider biopsy or referral?

Consider biopsy or dermatology referral when lesions are atypical, scaly, widespread, ulcerated, rapidly progressive, treatment-resistant, or when the differential includes tinea, sarcoidosis, cutaneous lupus, or other granulomatous disorders.