It is not common to experience acne breakout after Rejuran treatment. In fact, inflammatory acne and oily skin should improve after Rejuran injection. Rejuran consists of purified polynucleotides and there are various studies done which have shown that polynucleotides help with wound healing and improves skin texture, scars and acne. Hence, it is unlikely that one will get a breakout after Rejuran Skinbooster treatment.
However, if you have very sensitive or acne prone skin, it is still possible to develop breakout after Rejuran treatment as it is administered via multiple fine needle intradermal injections. Post-treatment skincare must be in place to prevent infection at the injection sites. In the rare occurrence (which I have not encountered personally), there is a remote possibility of developing an allergic reaction to the polynucleotides as Rejuran is derived from salmon germ cells. However, as salmon DNA is very similar to human DNA, the chances of developing an allergy is very rare.
Moreover, Rejuran is produced under stringent control and the special purification method used ensures that any antigen/protein that may cause an allergic reaction is removed.