Until my skin got used to waxing, and it took about 2 years of “regular” waxing (about once per month), I would have to use hydrocortisone cream on it for a few days post-wax, due to the itchy rash (small) it would cause.
If yours is pimples can you wash your face immediately after the wax? And if this isn’t feasible, carry a small bottle of toner and some facepads in your purse and kind of run it over the area. It may not be due to the waxing/threading, but due to whatever they use on your skin before and/or after. I’d also speak to them about using something for sensitive/oily skin if they have it.
I don’t know what threading is, but after waxing or plucking my eyebrows the same thing happens to me. I found out that if I wash my face afterwards and apply my face lotion after drying my face, it helps a ton.
Yeah, after waxing you’re not supposed to apply anything to the skin right away. Try not to touch the area, nor apply make-up or lotions. Try dabbing the area with a cotton pad, soaked with witch hazel. It’s soothing and anti-bacterial. A life saver.