Melasma assessment severity index

Author:Prof. Dr. med. Peter Altmeyer

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Last updated on: 29.10.2020

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Synonym(s)

MASI

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DefinitionThis section has been translated automatically.

Index for assessing the extent and severity of melasma.

Included are 4 facial regions and 3 summing criteria:

facial regions:

  • Forehead region (30%)
  • Left cheekbone region (30%)
  • Right cheekbone region (30%)
  • Chin region (10%)

The clinical criteria are:

  • Area (0=not involved; 1=<10%; 2 = 10%-29%; 3 = 30%-49%; 4 = 50%-69%; 5 = 70%-89%; 6= 90%-100%)
  • degree of pigmentation (0 = absent; 1 = slight; 2 = mild; 3 = marked; and 4 = maximum)
  • Homogeneity (0 = absent; 1 = slight; 2 = mild; 3 = marked; and 4 = maximum)

Note(s)This section has been translated automatically.

The MASI score is calculated by adding the sum of the severity ratings for darkness and homogeneity, multiplied by the value of the area of involvement, for each of the 4 facial areas.

The score ranges from 0-48. It can be used as a baseline and also for treatment follow up.

LiteratureThis section has been translated automatically.

  1. Pandya AG et al (2011) Reliability assessment and validation of the Melasma Area and Severity Index (MASI) and a new modified MASI scoring method. J Am Acad Dermatol 64: 78-83.

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Last updated on: 29.10.2020