What will my Blemish look like immediately post treatment? This is a really important question and one you need to know in order to make a decision on when is the right time to get a blemish treated especially if on your face. Blemishes will look different dependent on the blemish and size of blemish being treated. Firstly, the technique I use to treat blemishes called diathermy, which involves using a small probe and a gentle current to cauterise the blemish. It’s quick, precise, and minimally invasive—but yes, there will be some immediate changes to the skin. Right after your treatment, the area might look a little red and sometimes