Seriously: that is highly experimental technology, based on an experimental technique, in a very specific part of the body.
It is not remotely trivial to do that on regular skin. I know in particular because a friend just submitted his PhD on the use of microdermal patches for blood analysis: the short answer is, it might work, but no one actually has any idea how the levels of things they detect relate to what the normal blood levels are which our current health science is based on.
EDIT: Also no one has any idea of what the sensor longevity would be. For new stuff like this, the answer tends to be single-use.
Seriously: that is highly experimental technology, based on an experimental technique, in a very specific part of the body.
It is not remotely trivial to do that on regular skin. I know in particular because a friend just submitted his PhD on the use of microdermal patches for blood analysis: the short answer is, it might work, but no one actually has any idea how the levels of things they detect relate to what the normal blood levels are which our current health science is based on.
EDIT: Also no one has any idea of what the sensor longevity would be. For new stuff like this, the answer tends to be single-use.