Reflexive TattooEquipment 7
Source Pathfinder Lost Omens: The Grand Bazaar
Price 350 gp
Weight negligible
This subtle pattern of complex dots, sunbursts, and lines is difficult to make out, as it's a near match for the wearer's skin tone. Serving as a barrier facing inward, this tattoo prevents ostentatious expressions of spells that are internal to you, making them easier to hide.
Activate 
Interact (concentrate, manipulate, metamagic)
Frequency once per day
Effect If the next action you use is to Cast a Spell of 2nd level or lower that affects or targets only you, you can hide that you're casting it. This has the same effect as the Conceal Spell feat.
Traits
Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
InvestedA character can wear only 10 magical items that have the invested trait. None of the magical effects of the item apply if the character hasn't invested it, nor can it be activated, though the character still gains any normal benefits from wearing the physical item (like a hat keeping rain off their head).
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.
NecromancyEffects and magic items with this trait are associated with the necromancy school of magic, typically involving forces of life and death.
TattooA tattoo is a type of item that is drawn or cut into a creature's skin and usually takes the form of images or symbols.