Albert Barnes Commentary Leviticus 13:2

"When a man shall have in the skin of his flesh a rising, or a scab, or a bright spot, and it become in the skin of his flesh the plague of leprosy, then he shall be brought unto Aaron the priest, or unto one of his sons the priests:" — Leviticus 13:2 (ASV)

The skin of his flesh - An expression found nowhere but in this chapter. It probably denotes the cuticle or epidermis, as distinguished from the curls or true skin.

Rising ... scab ... bright spot - The Hebrew words are the technical names applied to the common external signs of incipient elephantiasis.

Like the plague of leprosy - Like a stroke of leprosy.