My little Lavender Orpington seems to have a large lump on her/his chest. The lump seems to be more to one side. It is soft and somewhat movable. This chick has always been the loudest chipper so I can’t tell if she/he is distressed. Little one is drinking and eating and running around like normal. Brooder temp is about 80 degrees. The other 3 in the brooder don’t seem to have such a prominent bump if any at all. They are being fed Earth First Chick Starter/Grower. No other food or treats. Fresh water daily. Pine shavings for litter. Just about a week since I got them so they are about a week and a half old. Am I an over worried chick mamma or am I justified? Any recommendations or guidance? My last 6 girls made it safe and healthy from the brooder to the coop so I’m green but not totally wet behind the ears to little ones. Please see the pics, brooder pic included.