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1. A dressing, configured to cover a wound, comprising: a substrate layer, being light-permeable; a contact layer, located at a side of the substrate layer, wherein the contact layer is configured to contact the wound or skin around the wound; and a readable pattern layer, disposed on the contact layer, comprising: a plurality of positioning marks, configured to define an information area, wherein the plurality of positioning marks comprises three colored squares respectively located at three corners of the information area, two of the three colored squares define an edge of a contour of the information area, most distant two of the three colored squares define a diagonal distance of the contour of the information area; and a plurality of colored cells, located within the information area, wherein at least part of the plurality of colored cells comprises a biological indicator, and the plurality of positioning marks and the plurality of colored cells are visible through the substrate layer; wherein the plurality of colored cells having at least part comprising the biological indicator are partially located between a space between the two of the three colored squares located at corners of the information area and defining the edge of the contour of the information area; wherein machine readable information stored within the edge of the contour of the information area defined by the two of the three colored squares remains a same during reaction of the biological indicator where the biological indicator changes color thereof to represent at least five different color shades; wherein a first part of a plurality of blank non-colored cells within the information area and a second part of a plurality of colored cells without biological indicator within the information area remains the same during reaction of the biological indicator, wherein the biological indicator is a microbial indicator that changes color in response to the amount of microbe.
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