Lawyers for Beauty Concepts LLC fired off a cease and desist letter to KK's legal team, claiming since July 2017 it's provided salon and skin care services under its SKKN+ brand name, owned by Cydnie Lunsford.

In the letter, obtained by TMZ, Beauty Concepts says it also operates a website and social media handles using the same block letters.

In the legal letter, Beauty Concepts says Kim's trademark application for "SKKN" is a ripoff of their innovative moniker and simply adding "By Kim" does little to differentiate the brands.

Beauty Concepts says it has used the SKKN+ name for 3 years before Kim's company applied for its trademark.