If the rot covers a particularly large area or extends beyond the door frame into the structure of the house more serious repairs will be necessary to keep the rot from returning.
Door frame wood filler.
Mix polyester wood filler or bondo wood filler and press it into the recess with a putty knife.
To repair rotted door frame first remove rotted wood with a 5 in 1 or other sharp tool.
Repair a door using wood filler with help from the owner of a home improvement compa.
Then coat the rotted door frame area with wood hardener as shown.
When the frame becomes rotted the door can also rot as well.
Wood filler can be used to repair your door in just a couple of minutes.
How to use epoxy on wood for repairs.
An infected door can pass the rot to the door frame and vice versa.
Inspect your door for wood rot.