Baby fat issue pocket on inner foot swollen red warm

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my son who is 16 mo old has fat pockets on the inner bottom of his feet between the heel and arch area. These are on both feet and totally normal from what I read. But yesterday the right foot fat pocket is now swollen, red, warm to the touch and when I rub it I feel many little bumps on the surface. I can't find anything on line that indicates that it is something. Could this fat pocket be infected or turn into a tumor that now needs removed. I have no idea what it could be. Thought maybe a bug bite and have watched it for about 36hrs with no change in size. It does itch as I see him rubbing it against the other foot at times.