Take these kind of charts with a grain of salt.

As someone who has several tattoos it's different for each person. Personally the worst pain I felt was on a specific part of my wrist and I have tattoos in my armpits.

A friend of mine says their worst tattoo was the one on their ass and another friend says the worst was her thigh.

It's generally accurate but everyone's different.

Scarring is also a factor. Scar tissue reacts differently than normal skin. Sometimes it can be less sensitive and other times they can be more sensitive.