At first the tattoo looks shiny, swollen and the colors are extra bright. Within 24 hours the scab forms, this should be very thin, looks like the tattoo and with proper care is slightly flexible.
After about 4-5 days the tattoo will go through a period of peeling. This looks similar to a sunburn peeling. The scab that peels off will be the color of the tattoo, and it will look like your tattoo is flaking off. Sometimes this stage is accompanied by mild itching which can be relieved by rubbing it gently with more ointment or lotion.
When the tattoo is completely done pealing you will notice a layer underneath the new tattoo that contains healing skin cells that will cause the skin to seem milky rather than transparent. Don't worry about this; it's all part of the healing process and only takes about a month to go away. If you want, you can put lotion on the tattoo to help it look brighter and more healed during this final stage of healing.
When healing goes wrong there are very few things that can happen. Some of the signs that things are going wrong are; extreme seeping, heavy scabbing, excessive inflammation, and sometimes a rash (little bumps) or pimples.
Often when things go wrong people assume that the tattoo is infected. Unless you work or live in a very dirty environment (see below) it probably isn't. You should always show the tattoo to your artists before heading for the doctors' office.
Most doctors know nothing about tattoo after care and some of them are prejudice against tattoos. They often time prescribe unnecessary drugs and treatment that can make the healing even worse.
A professional tattoo artist has been trained in healing correction. They know what infected tattoos look like and will only send you to a doctor when necessary. Seeing the right person can save you time and money, not to mention the finished look of your tattoo.