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You're misreading the effect. Assuming you're looking at the equipment effects sticky, If an item says -# , it means it reduces damage you take of that type or reduces your chance of being afflicted by that status. The Terrible Tattoo has +#, meaning it increases the damage you take and your chance of being hit with status conditions.
In other words, no, don't equip it.
- But sir! What if he dredges up old memories of people teasing you because of your girly name? - Konishi... Salt. Wounds. Stop.
Once you are at the near end game, you would be able to farm the tattoo for recipe (if you want it that early). Otherwise, you can find a mid-high quality grotto to farm it as well. It is not a difficult ingredient to find after all. But no, I deny to equip any cursed item!!