ESPN story:   The NBA is requiring LaMelo Ball to cover a tattoo below his left ear that the league insists violates rules against exposing commercial logos on players’ bodies – a policy that sources close to Ball contend has been infrequently enforced.

Lamelo Ball左耳下方的刺青LF(Ball的中間名縮寫，也是他個人衣服品牌的LOGO)，因為違反NBA的商標暴露規定，被官方要求必須要遮住，根據Ball身邊的人表示，這項規定很少執行。

In part, NBA spokesman tells ESPN "....We try to enforce the rule reasonably, in accordance with its purpose, and taking into account players' efforts to express themselves in a non-commercial manner. But LaMelo Ball's neck tattoo is in obvious violation of the rule and, accordingly, he's required to cover it."