Pain in abdomen after falling

[RJay_1986]

Last week, I tripped and hit the lower right side of my abdomen on a blunt object. It hurt a lot at the time, but the pain went away after a day or two. However, since then, I've been getting dull aches in the same spot. There's no bruise, but when I touch the area with my hands, it feels like there's a hard bump under the skin. For the first few days, it also hurt when I touched that area or when anything pressed up against it, but that's mostly gone away. I know pain on the lower right side of the abdomen can be a symptom of appendicitis, but since the problems were caused by trauma, I don't know if that's a cause for concern. Still, I'm worried and not sure what to do. Does this seem like something that'll go away on its own, or should I see a doctor? It's been ten days now and I haven't had any real problems, but it hasn't gotten better either.

If it's relevant: I'm 30 years old, male, and in relatively good health despite being slightly out of shape.