Find a dictionary. Look up the word dermis. According to the Merriam-Webster Dictionary, the dermis is "the sensitive vascular inner mesodermic layer of the skin." Merriam-Webster also offers a more simplistic, student definition of the word: "The sensitive inner layer of skin directly under the epidermis."
Look for the word's part of speech. According to Merriam-Webster, dermis is a noun. A noun is a person, place, thing, or idea. According to the Online Writing Lab at Purdue University, "nouns answer the questions, who and what."
Use dermis as the subject of the sentence: "The dermis was sliced from the deep incision."
Make the dermis the object of the sentence's action: "The incision cut through to the dermis."