how to isolate and texture a certain area of a mesh hello so i sculpted this beautiful boy over here and i want to make the area around his eyes alot darker than the rest of his body,most of the textures are procedural so is there of doing it in only the node editor.

thanks to moonboot for the answer
If you don't want to use any image texture you can do it with Vertex Paint:


Switch to Vertex Paint mode, open the Tool panel, choose a black color, select the Blend > Mix mode, paint around the eyes. The vertex paint only uses the vertices, so its smoothness and precision will depend on your mesh density:





As you can see it has created a Vertex Colors group:





In your Shade Editor, create a Input > Attribute node. In the Name field, type the name of the vertex color group you've just created. Now you can use it as a factor in a Mix Shader: