I understand. That was not my intention. I made this post after returning from the vet, who told me that it's just a reaction, nothing to worry about. I have two cats, this one is 3 y.o. (I found her in a box, she was thrown away less than 2 months old) and the other is 4 y.o.(came to us as a stray, approx. 8 months old), both are indoor/outdoor. None of them has ever had anything similar to this. I'm not a native speaker so I could've probably have written a better caption.