To be honest, I'm not convinced about the insect bite theory because in my experience they're usually red and itchy , whereas this one wasn't red and she hasn't been scratching. It looked and felt to me very like the warty lump that she had removed last year, but because she was starting to become stressed with both being at the vet's and two of us searching for the lump I decided it would be better to sit down quietly at home with her armed with a pile of treats and a small pair of scissors, give lots of rewards for letting me look, then gently trim the fur around the lump when I locate it so that when we go back to the vet it's easily found. I have been quite busy the last couple of evenings and didn't want to rush her with it, but tonight is a quiet night in, so that's the plan. Of course, the best possible outcome would be if it actually had gone, but it didn't look to me like something that would and I want to be absolutely certain because if it is something that needs to come off then presumably the smaller the better.