Hi, I'm a bit paranoid about lumps at the moment, as the lump that appeared about 6 months ago on my Z turned out to be a Mast Cell Tumour, Grade II. It first appeared similar to an "insect bite" and the vet initially said (when at visit for different reason) , just keep an eye on it. It kept changing, dissapearing and reappearing, and then reached a point where we knew it needed investigating, and now it has been removed (but unfortunately not with a good deep margin). I'm not trying to make you paranoid, but with the benefit of hindsight I wish I had kept a note of when it appeared, dates, how it looked etc. At least with photos you have a good record for observing changes. Not that it would have changed our outcome or timing of treatment, but it would have been easier to give the vets a definitive story rather than "well roughly, and I guess......" Good luck.