Melasma Area & Severity Index (MASI) - Scientific Formula
Dermatology Equation
Standard Calibration Equation:
MASI = 0.3(D+H)A_forehead + 0.3(D+H)A_r_cheek + 0.3(D+H)A_l_cheek + 0.1(D+H)A_chin
Accuracy Bounds & Limits:
While mathematical calculators evaluate demographic models, extreme variance (hyperthyroidism, dialysis cases, muscular bodybuilders, pregnancy) can trigger output errors. Weight and clearance assessments must follow separate personalized titration grids.