Instruct: Classify a given Amazon review as either positive or negative.
Query: Concerned

I am really worried because I've owned this pot since July and the other day I noticed that at the bottom in the center, there is a substantial bulge. I know that the base has aluminum encapsulated within and it appears that that has pooled in the very center and created a thickened area/bulge that makes me wonder if maybe that could be leeching into foods on the inside somehow. The pot has been used on low-medium heat and I cannot understand why this would happen. We always wash it by hand as well, so I am very dissatisfied and feel like I spent money on a brand I trusted. Hopefully it was just my pot that has this defect and the others are safe and durable.