1. approx 1 week.
2 both indoor and free to go out whenever he chooses (cat flap).
3 marks are not raised , more like "moles".
This seems to be a second area , the first now seems to be "healing " I wonder if it is simply a reaction to the flea treatment as suggested in the brochure ? but in answer to your question I would say Yes , it developed quite quickly .
1.medication called "Fiproline".
2. applied to the back of the neck under his collar , this "bald" area is on his chest well away from the application area.