GAGS (Acne)

Global Acne Grading System: Quantitative assessment of anatomical acne severity.

Forehead

Factor: 2

Right Cheek

Factor: 2

Left Cheek

Factor: 2

Nose

Factor: 1

Chin

Factor: 1

Chest & Upper Back

Factor: 3

Ready to Grade

Select the most severe lesion type for each anatomical region to calculate the global acne score.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Objective, quantitative assessment of acne vulgaris severity based on lesion type and anatomic location.

Tracking disease progression and response to topical or systemic therapy over time.

Standardization of acne severity in clinical trials.

Justifying escalation of therapy (e.g., initiating oral isotretinoin for severe or refractory cases).

Related Scores in Practice

In clinical practice, this assessment is frequently evaluated alongside other validated measures. Depending on the patient's presentation and specific diagnostic requirements, you may also need to utilize the IGA or the Rosacea Phenotype to formulate a comprehensive care plan.

Last Comprehensive Review: 2026

Related Dermatology Tools

RegiSCAR DRESS Validation

Breslow & Clark Microstaging

HiSCR

SCORAD

Lund-Browder Chart

Dermatology Calculators Internal Medicine Calculators Emergency Medicine Calculators

Have feedback about this calculator?Let us know.

In Recent Clinical News

Scanning Medical Journals

No new significant updates or guidelines matching this topic were found today. We will check again soon.

GAGS (Acne)

Global Acne Grading System: Quantitative assessment of anatomical acne severity.

Forehead

Factor: 2

Right Cheek

Factor: 2

Left Cheek

Factor: 2

Nose

Factor: 1

Chin

Factor: 1

Chest & Upper Back

Factor: 3

Ready to Grade

Select the most severe lesion type for each anatomical region to calculate the global acne score.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Objective, quantitative assessment of acne vulgaris severity based on lesion type and anatomic location.

Tracking disease progression and response to topical or systemic therapy over time.

Standardization of acne severity in clinical trials.

Justifying escalation of therapy (e.g., initiating oral isotretinoin for severe or refractory cases).

Related Scores in Practice

In clinical practice, this assessment is frequently evaluated alongside other validated measures. Depending on the patient's presentation and specific diagnostic requirements, you may also need to utilize the IGA or the Rosacea Phenotype to formulate a comprehensive care plan.

Last Comprehensive Review: 2026

Related Dermatology Tools

RegiSCAR DRESS Validation

Breslow & Clark Microstaging

HiSCR

SCORAD

Lund-Browder Chart

Dermatology Calculators Internal Medicine Calculators Emergency Medicine Calculators

Have feedback about this calculator?Let us know.