Hi win200,
We recommend waiting at least 4 weeks after your procedure to use any concealer, to avoid any risk of infection. One month after your procedure, you can use any kind of concealer or foundation, just make sure to wash it off completely at the end of the day. Powder foundation will be a better option as it causes less clogging of your pores, but you can use liquid if you prefer.
Please let me know if you have any other questions, we're here to help. We will be keeping in touch with you lots after your procedure as well and can answer any questions that may come up!
Best wishes,