That's small: 2 mm is about half the size of the diameter of a headphone jack on a cell phone or laptop. Lymph nodes are not that small, and fat globules that small probably would feel like normal skin. A tiny 2mm lump in the skin covering the sternum might be a comedone, because comedones do occur in that area, and they would be about that size. Of course, it takes an exam to help decide what the tiny lump is.
Answered 11/8/2017
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