Note: In 2017, a new standard classification and pathophysiology of rosacea was published in the Journal of the American Academy of Dermatology, accompanied by a commentary on rosacea comorbidities and future research. Developed by a consensus committee and review panel of 28 rosacea experts worldwide, the updated system is based on the substantial advances in the understanding of rosacea gained through scientific investigations over the last 15 years.
April 2002 • Volume 46 • Number 4
Standard classification of rosacea: Report of the National Rosacea Society Expert Committee on the Classification and Staging of Rosacea
Rosacea is well recognized as a chronic cutaneous disorder primarily of the convexities of the central face (cheeks, chin, nose, and central forehead), often characterized by remissions and exacerbations. Based on present knowledge, it is considered a syndrome, or typology, encompassing various combinations of such cutaneous signs as flushing, erythema, telangiectasia, edema, papules, pustules, ocular lesions, and rhinophyma.1 In most cases, some rather than all of these stigmata appear in any given patient.
Rosacea appears to be quite common, and in an epidemiologic study in Sweden its prevalence was 10%.2 It has been most frequently observed in patients with fair skin, but has also been diagnosed in Asians and African Americans. Rosacea occurs in both men and women and, although it may occur at any age, the onset typically begins at any time after age 30.3
Despite its apparent high incidence, the nosology of rosacea is not well established, and the term “rosacea” has been applied to patients and research subjects with a diverse set of clinical findings that may or may not be an integral part of this disorder. In addition to the diversity of clinical manifestations, the etiology and pathogenesis of rosacea are unknown, and there are no histologic or serologic markers.
Therefore, the National Rosacea Society assembled a committee to develop a standard classification system that can serve as a diagnostic instrument to investigate the manifestations and relationships of the several subtypes and potential variants of rosacea. Standard criteria for diagnosis and classification of patients are essential to perform research, analyze results and compare data from different sources, and may further serve as a diagnostic reference in clinical practice. The standard terminology will also facilitate clear communication among a broad range of basic, clinical, and other researchers; practicing dermatologists, primary care physicians, ophthalmologists and other specialists; health and insurance administrators; and patients and the general public.
The committee based the standard classification system on present scientific knowledge and morphologic characteristics. This avoids assumptions on pathogenesis and progression, and provides a framework that can be readily updated and expanded as new discoveries are made. As knowledge increases, it is hoped that the definition of rosacea may ultimately be based on causality, rather than on morphology alone.
The following provisional classification system describes the primary features of rosacea and defines 4 subtypes and 1 variant. Evolution from one subtype to another may or may not occur, and research to investigate this process may provide important insight into the pathogenesis of rosacea. Regardless of subtype, however, each individual characteristic may progress from mild to moderate to severe. Early diagnosis and treatment are therefore recommended.
Rosacea typically affects the convexities of the central face. The presence of one or more of the following signs with a central face distribution is indicative of rosacea. These signs are commonly transient, and each may occur independently. Many patients may present with more than one of these diagnostic features.
- Flushing (transient erythema). A history of frequent blushing or flushing is common. Nontransient erythema. Persistent redness of the facial skin is the most common sign of rosacea. Papules and pustules. Dome-shaped red papules with or without accompanying pustules, often in crops, are typical. Nodules may also occur. Although patients with concomitant acne may exhibit comedones, comedones should be considered part of an acne process unrelated to rosacea.
- Telangiectasia. Telangiectases are common but not necessary for a rosacea diagnosis.
The following signs and symptoms often appear with one or more of the primary features of rosacea, but in some patients can occur independently.
- Burning or stinging. Burning or stinging sensations with or without scaling or dermatitis may occur, especially on malar skin.4 Plaque. Elevated red plaques without epidermal changes in the surrounding skin may occur. Dry appearance. Central facial skin may be rough and scaling so as to resemble dry skin and suggest an eczematous dermatitis, and may often include the coexistence of seborrheic dermatitis. This “dryness” may be associated with burning or stinging sensations, and may be caused by irritation rather than the disease process. Edema. Edema may accompany or follow prolonged facial erythema or flushing. Sometimes soft edema may last for days or be aggravated by inflammatory changes. Solid facial edema (persisting hard, nonpitting edema) can occur with rosacea, usually as a sequel of the papulopustular type, and also independently of redness, papules and pustules, or phymatous changes. Ocular manifestations. Ocular manifestations are common, and range from symptoms of burning or itching to signs of conjunctival hyperemia and lid inflammation. Styes, chalazia, and corneal damage may occur in many patients with rosacea in addition to cutaneous stigmata. The severity of ocular manifestations may not be proportional to those of the skin. Peripheral location. Rosacea has been reported to occur in other locations,5 but the frequency and occurrence of this are ill-defined. Rosacea in peripheral locations may or may not be accompanied by facial manifestations.
- Phymatous changes. These can include patulous follicles, skin thickening or fibrosis, and a bulbous appearance. Rhinophyma is the most common form, but other phymas may occur (Table I).
|Presence of one or more of the following primary features:|
|Flushing (transient erythema)|
|Papules and pustules|
|May include one or more of the following secondary features:|
|Burning or stinging|
The primary and secondary rosacea features described above often occur together. The most common patterns or groupings of signs are provisionally designated as specific subtypes of rosacea and are described here (Table II). Each subtype includes the fewest signs sufficient to make a diagnosis of the subtype (though not necessarily limited to these), and patients may have characteristics of more than one rosacea subtype at the same time.
Subtype 1: Erythematotelangiectatic rosacea
Erythematotelangiectatic rosacea is mainly characterized by flushing and persistent central facial erythema. The appearance of telangiectases is common but not essential for a diagnosis of this subtype. Central facial edema, stinging and burning sensations, and roughness or scaling may also be reported. A history of flushing alone is common among patients presenting with erythematotelangiectatic rosacea.
Subtype 2: Papulopustular rosacea
Papulopustular rosacea is characterized by persistent central facial erythema with transient papules or pustules or both in a central facial distribution. However, papules and pustules also may occur periorificially (that is, they may occur in the perioral, perinasal, or periocular areas). The papulopustular subtype resembles acne vulgaris, except that comedones are absent. Rosacea and acne may occur concomitantly, and such patients may have comedones as well as the papules and pustules of rosacea. Burning and stinging sensations may be reported by patients with papulopustular rosacea.
This subtype has often been seen after or in combination with subtype 1, including the presence of telangiectases. The telangiectases may be obscured by persistent erythema, papules, or pustules, and tend to become more visible after successful treatment of these masking components.
Subtype 3: Phymatous rosacea
Phymatous rosacea includes thickening skin, irregular surface nodularities, and enlargement. Rhinophyma is the most common presentation, but phymatous rosacea may occur in other locations, including the chin, forehead, cheeks, and ears. Patients with this subtype also may have patulous, expressive follicles in the phymatous area, and telangiectases may be present.
This subtype has frequently been observed after or in combination with subtypes 1 or 2, including persistent erythema, telangiectases, papules, and pustules. In the case of rhinophyma, these additional stigmata may be especially pronounced in the nasal area.
Subtype 4: Ocular rosacea
The diagnosis of ocular rosacea should be considered when a patient's eyes have one or more of the following signs and symptoms: watery or bloodshot appearance (interpalpebral conjunctival hyperemia), foreign body sensation, burning or stinging, dryness, itching, light sensitivity, blurred vision, telangiectases of the conjunctiva and lid margin, or lid and periocular erythema. Blepharitis, conjunctivitis, and irregularity of the eyelid margins also may occur.6 Meibomian gland dysfunction presenting as chalazion or chronic staphylococcal infection as manifested by hordeolum (stye) are common signs of rosacea-related ocular disease. Some patients may have decreased visual acuity caused by corneal complications (punctate keratitis, corneal infiltrates/ulcers, or marginal keratitis).7 Treatment of cutaneous rosacea alone may be inadequate in terms of lessening the risk of vision loss resulting from ocular rosacea, and an ophthalmologic approach may be needed.8
Ocular rosacea is most frequently diagnosed when cutaneous signs and symptoms of rosacea are also present. However, skin signs and symptoms are not prerequisite to the diagnosis, and limited studies suggest that ocular signs and symptoms may occur before cutaneous manifestations in up to 20% of patients with ocular rosacea. Approximately half of these patients experience skin lesions first, and a minority have both manifestations simultaneously.9
|Erythematotelangiectatic||Flushing and persistent central facial erythema with or without telangiectasia.|
|Papulopustular||Persistent central facial erythema with transient, central facial papules or pustules or both.|
|Phymatous||Thickening skin, irregular surface nodularities and enlargement May occur on the nose, chin, forehead, cheeks, or ears.|
|Ocular||Foreign body sensation in the eye, burning or stinging, dryness, itching, ocular photosensitivity, blurred vision, telangiectasia of the sclera or other parts of the eye, or periorbital edema.|
|Granulomatous||Noninflammatory; hard; brown, yellow, or red cutaneous papules; or nodules of uniform size.|
Granulomatous rosacea is characterized by hard, yellow, brown, or red cutaneous papules or nodules that may be severe and lead to scarring. These lesions tend to be less inflammatory than papules and pustules and sit upon relatively normal-appearing skin. They can vary in size among patients but are monomorphic in each individual patient, and typically appear on the cheeks and periorificial areas. Granulomatous rosacea may occur in locations other than those in which the phymas are observed. The presence of other rosacea signs is not needed for a diagnosis of the granulomatous rosacea variant.
The committee noted that certain disorders may have been prematurely identified as associated with rosacea or as a variant of rosacea, and for clarity should be recognized at this time as separate entities. There is insufficient basis at present to include the following conditions as types of rosacea.
Popularly known as pyoderma faciale, the grouping of this disorder as a type of rosacea is premature. It is characterized by the sudden appearance of papules, pustules, and nodules, along with fluctuating and draining sinuses that may be interconnecting. The condition appears primarily in women in their 20s, and intense redness and edema also may be prominent.
Steroid-induced acneiform eruption
Steroid-induced acneiform eruption is not a variant of rosacea and can occur as an inflammatory response in any patient during or after chronic corticosteroid use. The same inflammatory response may also, of course, occur in patients with rosacea.
Although rosacea papules may appear in the perioral area, as noted earlier, perioral dermatitis without rosacea symptoms cannot be classified as a variant of rosacea. Perioral dermatitis is characterized by such stigmata as microvesicles, scaling, and peeling.
This investigational instrument is intended to set the stage for a better understanding of rosacea and its subtypes among researchers and practitioners by fostering communication and facilitating the development of a research-based classification system. As a provisional standard classification system, it is likely to require modification in the future as the pathogenesis and subtypes of rosacea become clearer, and as its relevance and applicability are tested by investigators and clinicians. The committee welcomes reports on the usefulness and limitations of these criteria.
The Committee thanks the following individuals who reviewed and contributed to this document: Dr Joel Bamford, Department of Dermatology, St. Mary's/Duluth Clinic; Dr Mats Berg, Department of Dermatology, Mälar Hospital, Eskilstuna, Sweden; Dr Albert Kligman, Department of Dermatology, University of Pennsylvania; Dr Mark Mannis, Department of Ophthalmology, University of California-Davis; Dr Ronald Marks, Department of Dermatology, University of Wales Medical Center, Cardiff, Wales; Drs Gerd Plewig and Claudia Borelli, Department of Dermatology, Ludwig-Maximilians University, Munich, Germany; Dr Alfredo Rebora, Department of Dermatology, University of Genoa, Italy; Dr Diane Thiboutot, Department of Dermatology, Pennsylvania State University; and Dr Guy Webster, Department of Dermatology, Thomas Jefferson University. The final document does not necessarily reflect the views of any single individual, and not all comments were incorporated.
The National Rosacea Society is a 501(c)(3) nonprofit organization whose mission is to support rosacea research, including the awarding of research grants, and to provide educational information on rosacea to physicians, patients, and the public. Reports or inquiries should be directed to the National Rosacea Society, 196 James St., Barrington, IL 60010; telephone 1-888-662-5874; E-mail: email@example.com.
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