From Pathfinder Lost Omens The Grand Bazaar, which isn't enabled.

Reflexive Tattoo

ITEM 7

Price 350 gp

Usage tattooed on the body

Bulk —

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, spellshape)

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.

Pathfinder Lost Omens The Grand BazaarOGL