Hi, new to site and corn snakes. We have 2, 3 yr olds. They are doing really well hoever we have just noticed a lump on the lower right side of him. it feels quite sharpe under his skin- could it be ribs?? When we bought them they told us that they were both underweight and had been miss treated.... Do we need to see a vet?? or would they just leave them to heal as they would with us?? He is well, lively, eating well and has just shed. any advice/ suggestions greatly received