Self-current-generating skin-applicable patch comprising biodegradable metal

A self-current-generating skin-applicable patch, comprising:

• a first area in contact with an area of the user's skin and
• a second area being spaced apart from the first area and in contact with another area of the skin adjacent to the area of the skin where the first area is in contact,
• wherein the first area or the second area comprises a biodegradable metal which can be decomposed and absorbed by coming into contact with the user's skin or reacting with moisture within the tissue,
• wherein the patch comprises:
• a first electrode layer, which is provided in the form of a thin sheet in direct contact with the user's skin as a structure integrated with the first area and has at least one penetration part fluid-transferable from the side opposite to a skin-contacting side,
• a second electrode layer, which is made of a different material having a standard reduction potential that differs from that of a material forming the first electrode layer, is positioned at the side opposite to the skin-contacting side of the first electrode layer while being insulated from the first electrode layer, and is at least partially extended so as to be electrically connected to the second area, and
• a support layer, which is in the form of a sheet having a thickness and is positioned at the side opposite to the skin-contacting side of the first electrode layer, and is made of a hydrophilic material capable of supporting an ionic solution.