Dry skin lacks sebum and hence moisture retention/hydration. This leads to roughness, flakiness, dullness, a tight sensation, & more visible lines.
Oily skin produces excessive sebum that clogs pores & keeps them open, leading to pimples & their precursors (whiteheads, blackheads). The face appears shiny.
Combination skin is oily in the T-zone and dry elsewhere
Sensitive skin is usually of the dry type & thinner around the nose. There may be an unusual sensitivity (redness & rash) to extremes of temperatures, sunlight or irritants.
Matured skin appears gradually with the advancement of age, but it’s appearance may be accelerated without proper skin care in younger years.
It appears dry (as sebum secretion reduces in later years), lax & sagged.
Level of pigment ➢
Higher levels of pigment (melanin) allows the skin to tan easily while low levels of pigment predispose to the formation of freckles & sunburns. This helps choose the kind of sunscreen & also the energy settings for procedures done by the dermatologist.
This is a broad overview with some overlap, of course. Hope it’s helpful!