Autoimmune and Inflammatory Diseases That Can Mimic Rosacea: Four Dermatology Cases

Conclusions

• The presentation’s main conclusion is that rosacea-like facial redness should prompt careful consideration of autoimmune and inflammatory mimickers rather than assuming rosacea.
• Dermatomyositis can present with facial erythema that resembles rosacea or periorificial dermatitis, but hand findings, heliotrope rash, Gottron’s signs, shawl/V-neck/holster distributions, and biopsy or muscle/lung evaluation help confirm the diagnosis.
• Weakness is absent in many patients with dermatomyositis at presentation, so skin findings may precede or even replace overt myositis in clinically amyopathic disease.
• Workup for suspected dermatomyositis should be guided by clinical suspicion and include proximal strength testing, swallowing and lung assessment, muscle enzymes, selected antibodies, and pulmonary testing when indicated.
• Severe dermatomyositis generally requires systemic therapy, with steroids as a bridge and steroid-sparing agents such as methotrexate, mycophenolate, IVIG, rituximab, or interferon-targeted treatment.
• Angiolymphoid hyperplasia with eosinophilia can mimic acneiform or rosacea-like facial papules, and biopsy with eosinophil-rich vascular inflammation is key to diagnosis.
• Dupilumab may be an effective treatment for angiolymphoid hyperplasia with eosinophilia and may also help related eosinophilic disease phenotypes such as Kimura disease.
• Facial enlargement or telangiectatic plaques with chronic sinusitis should raise suspicion for sarcoidosis rather than phymatous rosacea, especially when biopsy shows granulomatous inflammation.
• Sarcoidosis can produce facial findings such as lupus pernio or angiolupoid sarcoid, and palpation plus histology can help distinguish these from benign telangiectatic or rosacea-like eruptions.
• Cutaneous lupus is a frequent and sometimes initial manifestation of systemic lupus, so scalp, ear, and facial examination are essential when lupus is in the differential.
• Discoid lupus is the most common chronic cutaneous lupus, often affects the head and neck, and can cause irreversible scarring and scarring alopecia, making early recognition important.
• Subacute cutaneous lupus tends to be photosensitive and can leave prominent post-inflammatory pigment change, especially in patients with more melanin, even when true scarring is absent.
• Medication review is crucial in suspected subacute cutaneous lupus because many common drugs can trigger it and stopping the culprit medication may resolve the eruption.
• ANA testing should not be ordered indiscriminately for all rosacea patients; instead, clinicians should screen for systemic symptoms and use skin biopsy to distinguish rosacea from autoimmune mimics.
• Overall, the talk argues that morphology, distribution, associated symptoms, biopsy, and targeted lab evaluation are more useful than broad screening tests for separating rosacea from inflammatory and autoimmune look-alikes.