There are 3 small lumps, each about half the size of a pea, 2 have dark reddish pigmentations. They are definitely not ticks. But they are in roughly the place where frontline gets dolloped on him every couple of months. They don't seem to be painful to touch in that he didn't growl or pull away when I peered and prodded at them. Does anyone know what they might be? Does it merit a trip to the vet for an otherwise healthy dog? (his next scheduled trip to the vet is in May for his vaccinations)