Dog scratch...should I go to the doctor?

My family owns two males dogs (a chihuahua and a terrier) that sometimes get into fights. Last night they were about to fight, and I got a scratch (about two inches long) on my arm from grabbing the chihuahua away from the terrier. It didn't break the skin or bleed. Usually these types of scratches go away... show more My family owns two males dogs (a chihuahua and a terrier) that sometimes get into fights. Last night they were about to fight, and I got a scratch (about two inches long) on my arm from grabbing the chihuahua away from the terrier. It didn't break the skin or bleed. Usually these types of scratches go away within a few hours or so, but I woke up this morning, and it was still there. Not only that, but all around the scratch is really tender. It almost feels like a bruise or muscle ache, but I don't think that's the case. Could it be infected?
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