One month post-treatment and I am getting new blisters on red ink part of my tattoo

Hello,Tattoo removal, if not done correctly, can result in either scarring or ghosting.  Here are some tips:
Find a reputable office with a Pico laser. It produces faster results with less scarring than a nano alone.  
Tattoo removal shops are not as reputable as a Doctor. Many of these shops close as quickly as they open, leaving you out of luck on pre-paid packages.
Stay out of the sun— sunlight can be harmful to healing in after any laser procedure
Avoid infections- This means keep your tattoo area clean (i.e. don’t garden right after a tattoo removal on your arm, etc), don’t pick scabs or blisters if they occur.  Follow our post procedure instructions.  Avoid swimming for 48 hours as water can infect the treated areas.
Allow healing between treatment sessions- typically 4-8 weeks.
Be healthy- while the tattoo laser breaks up the tattoo particles, your body will actually eliminate the particles. Being healthy will help achieve this process faster and allow for consistent healing. Drink lots of water, get adequate sleep, and eat vitamin enriched foods. Dr. Anil Shah

Since it has been a month the area should have healed.  If it healed and then blistered one month later it could be a reaction or allergy to the ink in the tattoo.  I would seek medical attention and have the area examined by the place that you had the tattoo lasered.   The doctor there should be able to examine you and determine what is going on with the lasered area.
Thank you for your question.