Ah, the leper in scene 3 of "A Christmas Carol" represents ignorance and want. It's like Dickens is saying, "Hey, look at these two little brats, they're the embodiment of all that's wrong with society." So, yeah, the leper is basically a symbol of poverty and social issues staring Scrooge right in the face.
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Good question, but the answer is simple: I don't know go ask your mother! Just kidding, it represents how scrooge would get sick or diseased if he kept his greedy ways.