A computer-implemented method and system for tracking skin concerns. Color-coded substrates come in different colors, each color being associate with a different skin concern. The color-coded substrates include at least one hydrocolloid and active agent. The color-coded substrates can come in different area-specific shapes for applying on different areas of the skin or face. The color-coded substrates can come in different dosages. A computing device, such as a smartphone, can be used to take scans of the skin with or without substrates, and the computing device is configured to analyze the skin and color-coded substrates based on color or shape or other symbols to make recommendations so that a subject will be able to track the progress of any skin concern.