Read heads, aka fingers, are people with red/orange hair that come from the depths of hell and have no soul. Be careful when you encounter a redhead.
Guy 1: "Look at that red head over there!"
Guy 2: "Let's get out of here before she devours us."
Red Head Skin really just means you have pale skin and your hair is red. Brown eyeliner usually looks good with red head skin.
Girl 1: "Brown eyeliner looks good."
Girl 2: "What do you mean, brown eyeliner is the worst."
Girl 1: "No, it goes well because I have red head skin."