Several things affect the length of time it takes for a tattoo to heal. The itching is part of the healing process but normally happens when the tattoo is dry and scabbing over. It can be as short as 4 days, and for a very big tattoo could be more like 10 days.
There are three things that you must not do :
Pick the scabs - this could take the ink out of the skin and you will have to go and have the tattoo touched up
Do not use cotton Wool - this has too many small fibres and there is a chance that they will all get into your tattoo and make the itching worse and the ink colour uneven.
Do not use Vasoline - Many people recommend using petroleum jelly and covering with cling-film, however, these are good for keeping the tattoo clean until you get home and can wash it. A warm, damp, open wound is a great breeding ground for bacteria, so I would really recommend against this method.
Once you come back from the tattoo parlour:
- Wash the tattoo with a mild soap and pat dry very gently - don't rub it!
- Apply Bepanthon all over
- Do not scratch it, as you will make it feel more itchy and germs from under your nails could infect it
- Wash and reapply cream every 3-4 hours
If your tattoo is somewhere where clothes rub, or if you feel discomfort during the night, then you could cover with cling-film then, but be sure to get the air to it during the day.