My daughter is 3 years old and has a bump on her arm. Sometimes it looks like it has pus and she scratches it (I think, not because it itches, but because she doesn t like the raised feeling...) She has eczema, which has gone away after removing milk, due to milk allergy...the bump has a white circle (halo) around it...have read about the halo and am not worried about that, but am concerned because the bump won t go away.