A wearable patch includes a stretchable and permeable substrate having a first opening, a temperature sensing unit mounted in the stretchable and permeable substrate, wherein the temperature sensing unit comprises a temperature sensor for measuring a user's skin temperature, electrodes attached to the stretchable and permeable substrate. The electrodes include a bottom surface that can contact with the user's skin and to pick up electric signals from the user's body, and a circuit substrate on the stretchable and permeable substrate. The circuit substrate includes an electric circuit. A semiconductor chip is mounted on the circuit substrate. The semiconductor chip can receive a first electric signal from the temperature sensor in response to a temperature measurement of the user's skin. The semiconductor chip can receive a second electric signal from the electrodes in response to electric signals picked up from the user's body.
