This app can be used for calculating Melasma Area Severity Index (MASI), Modified Melasma Area Severity Index (mMASI) and Melasma Severity Index (MSI) by entering the values of Darkness of Forehead lesion(0-4), Homogeneity of Forehead lesion (0-4), Area of Forehead Lesion (0-6), Darkness of Right Malar lesion(0-4), Homogeneity of Right Malar lesion (0-4), Area of Right Malar Lesion (0-6), Darkness of Left Malar lesion(0-4), Homogeneity of Left Malar lesion (0-4), Area of Left Malar Lesion (0-6), Darkness of Chin lesion(0-4), Homogeneity of Chin lesion (0-4), Area of Chin Lesion (0-6), Pigmentation of Right face lesion (0-4), Area of Right Face lesion (0-4), Pigmentation of Left face lesion (0-4), Area of Left Face lesion (0-4), Pigmentation of Nose lesion (0-4) and Area of Nose lesion (0-4).