Leviticus chapter 13, part 1

After reading Leviticus 13:

*This chapter is about infectious skin diseases. I should say up front  that I am not a medical professional, and neither were the ancient Israelite priests. From this chapter, it seems to me that standard practice was: If it looks bad, it is bad. They had no scientists with microscopes and Petri dishes to tell them exactly what was causing a particular issue. These things must be looked at by a priest to determine if a person was clean or unclean: Rashes, swellings, or bright spots.

So what is bad? (Automatically unclean):
-Sores on skin that have turned white, have white hair, and are more than skin deep
-spreading rashes and raw flesh
-White swellings with white hair and raw flesh, which sounds a lot like the first item on the list.
-A white or pink swelling that appears after a boil has healed and is more than skin deep and has white hair.
-A white or pink swelling, after a boil heals, that is not more than skin deep and doesn't have white hair, but is spreading.
-A burn that has raw flesh, is more than skin deep and has white hair.
-A burn that is not more than skin deep and doesn't have white hair, but is spreading.
-A sore on the head or chin, more than skin deep, with thin yellow hair. Called an itch.
-An itch that is spreading, no matter what it looks like.
-Reddish white sores on bald heads

Not so bad, or iffy: (Requiring  isolation to watch for a magical seven days)
-White spots on skin that are only skin deep and do not have white hair.
-A white or pink swelling that appears after a boil has healed, but does not have white hair and is not more than skin deep and does not spread.
-A burn that is not more than skin deep and does not have white hair and does not spread.
-A sore on head or chin not more than skin deep, with no black hair and no yellow hair, not spreading.

Clean:
-Skin and hair turning white from head to toe, without raw flesh.
-Skin that was raw flesh but has healed and turned white.
-The scar after a boil has healed.
-The scar from a burn
-An itch in the head or chin that is healing and is growing black hair
-Dull white spots
-Bald heads and foreheads without sores

What's with the white hair? As far as I know that is not a sign of disease. What happens to a person in isolation? How do they live their daily lives? After the seven days of isolation are up, they are to go back to the priest to be declared clean or unclean. If declared clean, they must wash their clothes (Not their bodies?) and they will be good to go. If declared unclean from an infectious skin disease, they must wear torn clothes, and  let their hair be messy, which are signs of grief. They must also cover the lower part of their face and yell,"Unclean, unclean." As long as they have the disease they must live alone outside the camp.

So, basic priestly medical duties consist of wait and see what happens, then diagnosis of clean or unclean. No treatments, no wound care, no basic hygiene instructions like washing or covering wounds to keep them clean. The priest's only concern was ceremonial cleanness or uncleanness.