I have a 9 year old Norwegian Forest Cat with a naturally thick coat. He is very happy and rarely scratches. He is brushed with a soft brush once a day. He has no antibug treatment. It is different story for my 5 year old son. He has a series of red itchy marks on his leg and itches other places on his body. My wife is constantly on the war with mites, with putting out bedding to sun. It rains nearly every day here and often heavily. The cloud cover is enough to make our warm summer cool to cold.
With COVID and the general ineffectiveness of Japanese pediatrician (they don't have much medicines approved for children), we avoid getting our son to the doctor. Is it feasible that our cat is the source of biting bugs even with no evidence on his fur?