By immobilizing the tyrosinase (TYR) substrate catechol in the carbon‐based working electrodes, a non‐invasive carbon printing bandage sensor and a minimally invasive carbon paste‐filled microneedle sensor were constructed to detect TYR enzyme biomarkers for early skin cancer diagnosis.[25] The production of benzoquinone by the oxidation of catechol in the presence of TYR can be measured amperometrically at a potential of −0.25 V (Figure 4d). Here, TYR is linked to skin neoplasm.