When you conflict, you can't patch..
You need to investigate that.
Here is what Oracle Support says about it ->
The fastest and easiest way to determine whether you have one-off patches in the Oracle home that conflict with the PSU, and to get the necessary conflict resolution patches, is to use the Patch Recommendations and Patch Plans features on the Patches & Updates tab in My Oracle Support. These features work in conjunction with the My Oracle Support Configuration Manager. Recorded training sessions on these features can be found in Document 603505.1. Alternately, there are instructions in the PSU README for determining what patches are needed.