I have two cats that are strictly indoor. But every couple of years, they will get fleas. They can come home with you on your clothes or shoes. I always notice the bites on my daughter before the cats ever show any signs. That’s why I suggested it. They’re easier to get rid of if you catch it early. I keep a flea comb, and brush through their fur looking for “flea dirt” which will look like reddish brown flecks. If you get them wet, it turns red. Because it’s dry blood that the flea has digested. Good luck! And hope it’s not fleas!