Gentlemen, we're on the subject of periods.
Not surprisingly, a woman is unclean when she's on the rag. Since the Bible was written by men who were in the dark on these important manners, this is for the duration of two whole weeks. Because apparently that's how long periods last. Maybe that's the case if you've grown up on a diet of low-quality hormone-laden dairy and meat but otherwise -- and don't quote me on this -- you're looking at three to six days typically.
If a woman gives birth to a male child, she is unclean for thirty-three days; if she gives birth to a female child, it's sixty-six days because girls are exactly twice as gross as boys. My question is: what if she gives birth to an intersexual child? Huh? I guess she would be unclean for forty-nine and a half days.
Leviticus 13 turns to all things having to do with leprosy. How to diagnose, when to pitch tainted clothing, etc. For example, when you have an open sore (just one?), check to see if the surrounding hairs have turned white. If they're white, you have leprosy. This gets confusing if you're old and already have white hairs on your person. I'd recommend playing it safe and assuming you are indeed a leper.
The Bible instructs the leper to do the following: "wear torn clothes and let the hair of his head hang loose, and he shall cover his upper lip and cry, "Unclean, unclean." (Lev 13:45). Seems a tad harsh.
Leprosy is also known as Hansen's disease and according to Wikipedia, World Leprosy Day is January 31. Mark that in your calendars.