Post Tattoo Removal Treatment. Is this "normal"?

Based on your description, I recommend following up with your Doctor for aftercare. Some blistering can be normal, but extreme blistering and swelling is not. See an expert. Best, Dr. Emer

Thank you for your question. It is difficult to give you advice without seeing a picture. However, some blistering, crusting and bleeding is usual after laser tattoo removal. As your treatment progresses is sometimes necessary to become more aggressive with the settings. This is to get the best outcome. It could be possible that your treatment was too aggressive. I recommend having your arm evaluated and discussing your concerns with your physician. Your physician will be able to determine the best treatment plan for you. Best of Luck!

No photo makes it hard to determine what is going on with your tattoo. It sounds as if they do a multiple pass technique which I am personally not a fan of. The pulses generated are vey high unless this is an enormous tattoo. I am concerned that you are developing a compartment syndrome in that arm, its severe swelling that compresses nerves and blood vessels. I would go to an emergency room if it becomes worse, goes numb or fingers and nails change color. 
I have my doubts on how normal your arm will look after this process is over.