armpit transplant

Hi Nika, thanks for your question, the reason is because bacteria are living in the deeper skin layers, and they are able to come back after a 'disturbance'. There is a number of reasons why a specific microbiome is able to come back, for instance: the skin immune system, nutrition, environment, clothing, genetics (family), ethnicity, gender, body mass index, age, etc. It would benefit from a more consistent alteration of the microbiome; exactly what we are working on at this moment. So I hope to come with good news soon. Best, Chris