Ink spreads a bit in your body as your tattoo ages – this is normal and there’s no way around it. Doing a tattoo too small is a good way to guarantee wearing a blob later in life. It’s of course hard to say for sure without seeing the picture you’re talking about and knowing how small you’re trying to get it, but chances are the artist is trying to keep you from making a mistake by going to small. Additionally, when it comes to tattoos, bigger almost always looks better.

It depends on the design but sounds like what you read is wrong, not the artist.