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2009:75:3;323-326
doi: 10.4103/0378-6323.51258
PMID: 19439902

Scoring systems in acne vulgaris

Balaji Adityan, Rashmi Kumari, Devinder Mohan Thappa
 Department of Dermatology and STD, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry - 605 006, India

Correspondence Address:
Devinder Mohan Thappa
Department of Dermatology and STD, JIPMER, Pondicherry - 605 006
India
How to cite this article:
Adityan B, Kumari R, Thappa DM. Scoring systems in acne vulgaris. Indian J Dermatol Venereol Leprol 2009;75:323-326
Copyright: (C)2009 Indian Journal of Dermatology, Venereology, and Leprology

Introduction

Acne vulgaris remains one of the most common diseases afflicting humanity and it is the skin disease most commonly treated by physicians. [1] It is a disease of the pilosebaceous units, clinically characterized by seborrhea, comedones, papules, pustules, nodules and, in some cases, scarring. [2] Although easy to diagnose, the polymorphic nature of acne vulgaris and its varied extent of involvement do not permit simple evaluation of its severity. Because the acne lesions may vary in number during the natural course of the disease, various measurements have been developed, based on clinical examination and photographic documentation, to assess the clinical severity of acne vulgaris. [3] Moreover, if the acne treatment regimens produced an all-or-none response, then acne measurements would be unnecessary. [3]

Grading versus lesion counting

Methods of measuring the severity of acne vulgaris include simple grading based on clinical examination, lesion counting, and those that require complicated instruments such as photography, fluorescent photography, polarized light photography, video microscopy and measurement of sebum production. The two commonly used measures are grading and lesion counting [Table - 1].

Grading is a subjective method, which involves determining the severity of acne, based on observing the dominant lesions, evaluating the presence or absence of inflammation and estimating the extent of involvement. [3] Lesion counting involves recording the number of each type of acne lesion and determining the overall severity.

Photography has also been used as a method of measuring acne severity. Drawbacks of this approach include the following:

  1. Does not allow palpation to ascertain the depth of involvement. [3]
  2. Small lesions are often not visualized. [3]
  3. Maintaining constant lighting, distance between the patient and camera and developing procedure is difficult. [4]

Fluorescence and polarized light photography have some advantages over normal color photography in estimating the number of comedones and emphasizing erythema. However, the disadvantages include problems such as excessive time involvement and the need for more complicated equipment.

Individual methods

Although acne vulgaris has plagued humankind since antiquity, the need for grading acne vulgaris was felt when the therapies available for treating acne increased in the 1950s. Probably, the first person to use a scoring system for acne vulgaris was Carmen Thomas of Philadelphia. She used lesion counting in her office notes, starting in the 1930s. [5] Several systems for grading the severity of acne currently exist.

In 1956, Pillsbury, Shelley and Kligman published the earliest known grading system. [3] The grading includes the following:

  • Grade 1: Comedones and occasional small cysts confined to the face.
  • Grade 2: Comedones with occasional pustules and small cysts confined to the face.
  • Grade 3: Many comedones and small and large inflammatory papules and pustules, more extensive but confined to the face.
  • Grade 4: Many comedones and deep lesions tending to coalesce and canalize, and involving the face and the upper aspects of the trunk.

In 1958, James and Tisserand in their review of acne therapy, provided an alternative grading scheme [3]

  • Grade 1: Simple non-inflammatory acne - comedones and a few papules.
  • Grade 2: Comedones, papules and a few pustules.
  • Grade 3: Larger inflammatory papules, pustules and a few cysts; a more severe form involving the face, neck and upper portions of the trunk.
  • Grade 4: More severe, with cysts becoming confluent.

The response to acne therapy could never be precisely assessed by grades of 1 to 4 and such classification systems are overly simple. [6] In 1966, Witkowski and Simons [7] initiated lesion counts for assessing the severity of acne vulgaris. Lesions were counted on one side of the face as a time-saving measure, after it was established that the number of lesions of the left side was nearly equal to those on the right.

In 1977, Michaelson, Juhlin and Vahlquist [8] counted the number of lesions on the face, chest and back. They gave a different score to each lesion type. Comedones were valued at 0.5; papules, at 1.0; pustules, at 2.0; infiltrates, at 3.0; and cysts, at 4.0. By multiplying the number of each type of lesion by its severity index and adding each product, these authors obtained a total score that represented the severity of the disease for each visit. This grading system has been criticized on the grounds that scores ascribed to lesions are non-parametric, whereas absolute counts are a parametric data and it is probably wrong to mix these two types of data.

In 1979, Cook, Centner and Michaels [9] evaluated the overall severity of acne on a 0-8 scale anchored to photographic standards that illustrate grades 0, 2, 4, 6 and 8 [Table - 2]. In addition to the photographic standards, a nine-point scale for comedones, papules and macules over the face was used in conjunction for more sensitivity.

In 1984, Burke, Cunliffe and Gibson [10] presented the Leeds technique. They described two scoring systems. The first is an overall assessment of acne severity for use in routine clinic and the second, a counting system for detailed work in therapeutic trials. A scale of 0 (no acne) to 10 (the most severe) was used for grading. The groups 0 to 2 were divided into subgroups, by 0.25 divisions. Grades 0.25 to 1.5 represented patients with physiological acne or "acne minor" and those with grades of 1.5 or more have clinical acne or "acne major."

In 1996, Lucky et al ., [11] assessed the reliability of acne lesion counting. Acne counts were recorded on a template divided into five facial segments: Right and left sides of the forehead, right and left cheeks and chin. The nose and the area around it were excluded. Counts of each lesion type were recorded within each segment of the template. Total lesion count, along with total inflammatory lesions and comedonal counts, were then calculated. They concluded that reliability of acne lesion counting was excellent when performed by the same trained rater over time.

In 1997, Doshi, Zaheer and Stiller [12] devised a global acne grading system (GAGS). This system divides the face, chest and back into six areas (forehead, each cheek, nose, chin and chest and back) and assigns a factor to each area on the basis of size [Table - 3].

In 2008, Hayashi et al. , [13] used standard photographs and lesion counting to classify acne into four groups. They classified acne based on the number of inflammatory eruptions on half of the face as 0-5, "mild"; 6-20, "moderate"; 21-50, "severe"; and more than 50, "very severe." Other grading systems used for grading acne vulgaris are summarized in the [Table - 4].

Acne vulgaris was graded by Indian authors, [14] using a simple grading system, which classifies acne vulgaris into four grades as follows.

  • Grade 1: Comedones, occasional papules.
  • Grade 2: Papules, comedones, few pustules.
  • Grade 3: Predominant pustules, nodules, abscesses.
  • Grade 4: Mainly cysts, abscesses, widespread scarring.

Conclusion

Assessment of the severity of acne vulgaris continues to be a challenge for dermatologists. No grading system has been accepted universally. An ideal grading system would

  1. Be accurate and reproducible.
  2. Capable of documentation for future verification.
  3. Be simple to use by the clinician over serial office visits.
  4. Be less time consuming.
  5. Be less expensive and simple.
  6. Reflect subjective criteria, i.e., psychosocial factors.[21]
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