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The history you gave was excellent and important!
As far as the current problem with the scrotal swelling and itching:
chances are that it is nothing more than an insect bite, or a reaction to new detergent used in your laundry etc.
However, there are some times that scrotal swelling is an emergency.
If you were having a lot of pain (which you didn't mention) we would worry about testicular torsion.
Other things to consider are hydrocele (fluid in the scrotal sack), varicocele (an enlarged vein in the scrotal sack), trauma (you didn't mention that there was any trauma), tumor, idiopathic scroatl edema (which basically means we don't know why it is swelling) among others.
As some of these problems can be emergencies it is important that you go to the emergency room to make sure you are okay.
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No trauma, no pain, simply that the degree of enlargement means I am having to walk like a cowboy and it feels sore on the surface rather than painful from within.
If you would like to read more about scrotal sweeling, the National Library of Medicine has a link that you might want to click to. www.nlm.nih.gov/medlineplus/ency/article/003161.htm