Hello, I’ve got some issues with my modelling : when I’m in sculpt mode, there are some black face but they disappear when I’m in another mode like edit mode, object mode, …
Here is a image in sculpt mode :
For information, I’ve already tried “recalculate the normal” and “auto-smooth”.
Thanks in advance for your help and sorry for my English of a beginner 
Have you tried clearing masks? (ALT M)
Sometimes “recalculate normals” doesn’t work and you need flip the normals manually.
Please enable face orientation mode to see if the normals are realy ok. (see the pics)
If you see red faces the normals are inverted.
Yes, I’ve already tried
Here is the results in sculpt mode.
And it’s appeared after a Boolean with two object, I’ve noticed that when I turn on the “Dyntopo” it disappears but when I turn it off, the black come back…
This black color remenber me vertex colors or display color in the material mode visualisation. We need verify this, and if you can please send the file here so I can inspect and search a solution.
Some things in Blender have bugs, and when modifiers are applied sometimes mess the normals. I remember this problem but not the solution, various things can cause this problem and bugs in Blender is not discarded.
Thanks for your reply. Finally, I “remesh” all the model but with unchecking all the checkmarks and it work.
But thanks anyway.
It was vertex colors- by remeshing, you removed the vertex colors (as you didn’t check the Color Attributes preservation box). Just for future reference 
Ok, thanks for the explanation
