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- Presentation
Clinical Diagnosis and Phenotypes of Rosacea, Including Mimickers and Neurogenic Rosacea
Description
This presentation reviews how to diagnose rosacea using the updated phenotype-based framework and highlights common mimickers and special variants. Rosacea can be diagnosed by either of two diagnostic phenotypes: fixed centrofacial erythema that may periodically intensify, or phymatous changes. If those are absent, at least two major phenotypes are needed: papules/pustules, flushing, telangiectasia, or ocular involvement. The talk explains the typical distribution and appearance of each feature, including central facial redness, papulopustular lesions without comedones, prolonged flushing triggered by heat, exercise, spicy foods, alcohol, or stress, and telangiectasia most visible on the central face. Ocular rosacea is emphasized as common and potentially sight-threatening, with symptoms such as burning, tearing, gritty sensation, photophobia, and signs like lid-margin telangiectasia, meibomian gland dysfunction, and interpalpebral conjunctival telangiectasia. Secondary features include burning, stinging, edema, dryness, and overlap with seborrheic dermatitis. The speakers also discuss diagnosing rosacea in darker skin tones, where erythema may be harder to see and tools like dermoscopy, diascopy, and targeted history are helpful. Briefly, granulomatous rosacea is described as a less typical variant, and neurogenic rosacea is presented as a pain-predominant form with marked dysesthesia, heat sensitivity, migraine/fibromyalgia associations, and better response to neuropathic pain agents than standard rosacea therapies.
View moreConclusions
- Rosacea is best diagnosed using a phenotype-based approach, with fixed centrofacial erythema or phymatous change alone being diagnostic.
- Papules and pustules, flushing, telangiectasia, and ocular findings are major phenotypes that support diagnosis when present, especially if two or more occur without a diagnostic phenotype.
- Rosacea commonly involves the central convexities of the face and is distinguished from acne by the absence of comedones.
- Flushing that is frequent, trigger-associated, and prolonged is more suggestive of rosacea than brief emotional blushing.
- Ocular rosacea is common, may be independent of skin severity, and can be sight-threatening if not recognized.
- In darker skin tones, rosacea is still present but erythema is harder to see, so dermoscopy, diascopy, and symptom history become especially important.
- Granulomatous rosacea appears to be a distinct variant with different clinical features and is less typical than classic rosacea phenotypes.
- Neurogenic rosacea is characterized by prominent burning pain and dysesthesia out of proportion to visible inflammation and often overlaps with neurologic or psychiatric comorbidity.
- Standard rosacea therapies may be ineffective for neurogenic rosacea, which may respond better to neuropathic pain agents such as gabapentin, pregabalin, or certain antidepressants.
- Laser or light-based treatment should be used cautiously in neurogenic rosacea because photosensitivity can worsen symptoms.
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