en_tn/num/05/02.md

infectious skin disease

This refers to leprosy, which is a sickness that affects the skin and easily spreads to other people.

oozing sore

This refers to an open cut that is leaking fluids.

whoever is unclean through touching a dead body

If a person touched a dead body they were considered unclean. A person who is not acceptable for God's purposes is spoken of as if the person were physically unclean. (See: rc://en/ta/man/jit/figs-metaphor)