Large scale diy jobs present the same problem.
Replaster bathroom wall.
Where the shower curtain rod is in contact with the wall the plaster has begun to break away most likely due to continued exposure to moisture.
Crouch down and push the plaster up the wall in a gentle arc standing as you go to reach the higher parts.
Smear the plaster onto the wall starting with the bottom corner.
If you have hacked the plaster off half a wall it will probably be better to replaster the whole of it rather than simply making good the damaged area.
At the top of your stroke slide the trowel over 2 3 inches 5 8cm then reverse the motion and bring it down again.
When the plaster peels or cracks mildew can actually grow beneath the top layer.
But in this case you need to assess whether.
The walls in this bathroom are plaster and are painted with latex paint.
3 walls are your standard house brick and the 4th is an internal wall made of black 35mm thick air brick nasty stuff but not an option to remove.
The high humidity and wet conditions in a bathroom make its walls a prime breeding ground for mildew.
Walls which are intact but have a poor surface because of previous patching could be another candidate.
Including how to mix and apply pva mix plaster apply plaster and finish plaster.
I noticed this when i went to swap out the rod for a new one and began to peel some of the bubbling paint away.