If you have small holes in your walls that need to be patched, it may be helpful to decide first if they should be filled in. While it is possible to patch holes that are smaller and have no filling in them, it can also cause damage in the future if you do not do this the proper way. Here is a quick guideline that can help you to determine whether or not you want to fill the small holes in before working on the patches.
Check the Depth
The depth is the most important part. If the hole is deeper than a penny is thick, then you may want to consider filling it in before patching. The reason for this is because if you press on the patch later, you do not want it to move in and make another hole.
Check the Edges
One of the most important aspects of the hole to check is the edges and the missing parts. If the inside needs to be altered to take out pieces to smoothen it out or the edges need to be sanded, then there is a good chance that you will want to fill the hole in.