As more people have tattoos it has also become quite common to look for ways to hide for a day or two.   You might have a tattoo that you regret completely but it is also very common that you have a tattoo that you like but you need to attend an event with a strict dress code and you need to hide your tattoo.
For some people the only solution would be plastic surgery which can be quite expensive and leave at times some scars.   But that would not be the ideal solution if you want to keep your tattoo and only hide it say during the day at work.   These days you can find good tattoo concealers that can hide a tattoo very well, they are also very effecting at hiding  other skin blemishes.
There are many brands of tattoo concealers on the market, you could read some of the reviews on the internet for each product to give yourself an idea but in most case you will have to try a brand yourself and see the results you get with your skin tone and type of tattoo.