According to Baidu's experience, Tik Tok's avatar has become a blank avatar for the following reasons:

1. This account is blocked or marked as abnormal by Tik Tok platform.

2. In the process of changing the avatar, Android phone users will occasionally encounter the first unsuccessful phenomenon, and a black avatar will be displayed, and it will take many attempts to change the avatar.

3. Apple users' mobile phones do not support Tik Tok avatar transparency, and currently only support Android users.