Pico second lasers allow for more of a photomechanical and a lower photothermal effect, reducing the heat related risks of other technologies. The risk of blistering does not always occur after picosecond tattoo removal, but can be more prevalent in multi-coloured tattoos,  especially the reds, oranges and yellows. These colours tend to be deposited closer to the surface of the skin, causing more of a visible reaction.
It is important to note that this type of blistering is not the same as a photothermal burn and should not be disturbed during the healing process.  Cold compresses following a tattoo removal treatment will help prevent excessive swelling.
If blistering occurs, please let our clinic know to update your file and follow up if needed.  We know blistering does not look nice, but normally resolves on its own within 4-10 days.  During this time it is important to keep the area covered, apply an antibiotic cream or similar and do not rub or pick at the area.