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This is a shortened version of the twelfth chapter of the ICD-9: Diseases of the Skin and Subcutaneous Tissue. It covers ICD codes 680 to 709. The full chapter can be found on pages 379 to 393 of Volume 1, which contains all (sub)categories of the ICD-9. Volume 2 is an alphabetical index of Volume 1.
Lip licker's dermatitis which is a subtype of irritant contact cheilitis is caused by an exogenous factor rather than an endogenous one. [10] Irritant contact cheilitis can be separated into different reaction types, so it is an umbrella term and further evaluations are usually needed to properly classify the presenting condition.
The pathophysiology of perioral dermatitis is related to disease of the hair follicle as is now included in the ICD-11 due to be finalized in 2018. [22] Lip licker's dermatitis or perioral irritant contact dermatitis due to lip-licking is considered a separate disease categorized under irritant contact dermatitis due to saliva. [23]
Photographic Comparison of: 1) a canker sore – inside the mouth, 2) herpes labialis, 3) angular cheilitis and 4) chapped lips. [4]Chapped lips (also known as cheilitis simplex [5] or common cheilitis) [6] is characterized by the cracking, fissuring, and peeling of the skin of the lips, and is one of the most common types of cheilitis.
[9] The dermis is the layer of skin between the epidermis and subcutaneous tissue, and comprises two sections, the papillary dermis and the reticular dermis. [10] The superficial papillary dermis interdigitates with the overlying rete ridges of the epidermis, between which the two layers interact through the basement membrane zone. [10]
The word "prurigo" comes from the Latin word pruire, which meaning itching. Ferdinand von Hebra coined the term "prurigo" in Vienna in 1850 to describe papules and nodules that had severe pruritus. [2] Some authors categorize prurigo based on its nature (acute, subacute, or chronic), clinical manifestation, underlying cause, or related illness. [3]
Other antimalarials like amodiaquine, halofantrine, and hydroxychloroquine have also been linked to pruritus, albeit less frequently and to a lesser extent. [2] Another class of medications known to occasionally cause itching is known as serotonin reuptake inhibitors. [3] Itching is one of the most frequent adverse effects of opioid therapy. [4]
The exact mechanism of the condition is unknown. Some studies have suggested the itching occurs in response to increased fibrinolytic activity in the skin, [5] [6] inappropriate activation of the sympathetic nervous system, [7] increased activity of acetylcholinesterase, [8] [9] or an increase in mast cell degranulation that releases histamine and other chemicals into the body.