Thanks for your post.
It is possible that the swelling in the clitoris is due to multiple small cysts in the region. It could even be due to an enlarged blood vessel. If it is not causing pain you need not worry much. Soaking in a warm bath tub will help reduce the swelling.
Labia can be affected by rough surfaces like jeans, wool friction etc and being very sensitive changes color due to thickening of skin. Shaving is another cause of labia turning brown.
Hope this helps!