Today fabrication process that enables anyone to create customized functional devices that can be attached directly on their skin. Using different conductive thin sheet materials, a material that is cheap, skin-friendly, and robust for everyday wear, we are able to replicate three types of on-skin interfaces: sensing touch input, displaying output, and wireless communication. Those devices draws from the aesthetics found in metallic jewelry-like temporary tattoos to create on-skin devices which resemble jewelry.
Miniature devices have become wearable beyond the form factor of watches or rings, in fact they are capable to be directly affix to the user's skin, unlocking a much wider potential for wearable electronics. However in this moment building such a small and skin friendly devices currently requires expensive materials and equipment that is mostly found at medical professionals domain. While development in miniaturization of electronics created small devices that are capable to be embedded into fabrics, or warn as accessories, or be attached directly to the user body on skin.
Practical usability and application in those small sensors are limitless. It primary use might be for medical field to monitor Cardiac patients, diabetes patients (that require common insulin treatment and blood glucose monitoring) and similar medical conditions.