Keratosis pilaris

Source: Wikipedia, the free encyclopedia.
Keratosis pilaris
Other namesFollicular keratosis, lichen pilaris
Condition on a calf
SpecialtyDermatology

Keratosis pilaris (KP; also follicular keratosis, lichen pilaris, or colloquially chicken skin

hands, and tops of legs, sides, or any body part except glabrous (hairless) skin (like the palms or soles of feet).[3] Often the lesions can appear on the face, which may be mistaken for acne[4] or folliculitis
.

The several types of KP have been associated with

dry skin, allergic diseases (e.g., atopic dermatitis), and rarely cancer.[1] Many rarer types of the disorder are part of inherited genetic syndromes.[1]

The cause of KP is not completely understood. As of 2018, KP is thought to be due to abnormalities in the process of depositing the protein

dermoscopy can be used, as well, if the diagnosis is unclear.[1] Variants of the ABCA12 gene have been associated with KP.[5]

KP is the most common disorder of the hair follicle in children.[1] How common it is in adults is unclear since keratosis pilaris is an underreported condition and the actual prevalence of the condition may be higher than estimated.

carbon dioxide lasers and Nd:YAG laser therapies are also effective.[1]

Signs and symptoms

KP results in small, rough bumps on the surface of the skin. They are skin-colored bumps the size of a grain of sand, many of which are surrounded by a slight pink color in light-skinned people and dark spots in dark-skinned people.

inflammation
.

Though people with KP experience the condition year-round, the problem can become exacerbated, with the bumps likely to look and feel more pronounced in color and texture, during the colder months, when moisture levels in the air are lower.[8] The symptoms may also worsen during pregnancy or after childbirth.[9] Increased sun exposure might mitigate the symptoms of KP. [citation needed]

Pathophysiology

KP occurs when the human body produces excess amounts of the skin protein keratin, resulting in the formation of

hair follicles in the pore. This causes the formation of hard plugs (a process known as hyperkeratinization).[4] Many KP bumps contain an ingrown hair that has coiled.[2] This is a result of the keratinized skin's "capping off" the hair follicle, preventing the hair from exiting. The hair grows encapsulated inside the follicle. KP is more common in patients affected by atopic diseases such as allergic rhinitis and atopic dermatitis
.

KP subtypes are occasionally part of genetically inherited syndromes associated with

neuro-cardio-facial-cutaneous syndromes, RASopathies, ectodermal dysplasias, and certain myopathies.[1]

Diagnosis

Physicians can often diagnose KP simply by examining the skin without specialized tests,

dermoscopy to confirm the diagnosis and assess if a person with KP is responding to treatment.[2] Physicians often consider family history and the presence of symptoms when making the diagnosis.[10] Those with this condition are generally encouraged to contact a physician if the bumps are bothersome and do not improve with over-the-counter lotions.[4]

Differential diagnosis

Several medications that can cause a skin eruption similar to KP include

BRAF inhibitors, and tyrosine kinase inhibitors.[1]

Classification

The several different types of KP include KP rubra (red, inflamed bumps, which can be on arms, head, legs), KP alba (rough, bumpy skin with no irritation), KP rubra faceii (reddish rash on the cheeks), KP atrophicans, keratosis follicularis spinulosa decalvans, atrophoderma vermiculatum, KP atrophicans faciei, erythromelanosis follicularis faciei et colli, and papular profuse precocious KP.[1][7]

KP is commonly described in association with other dry-skin conditions, such as ichthyosis vulgaris, dry skin, and atopic dermatitis, including those of asthma and allergies.

hair shaft
exits the skin.

Gallery

  • Keratosis Pilaris on Back
    Keratosis Pilaris on Back
  • Keratosis pilaris on lower extremity
    Keratosis pilaris on lower extremity
  • Keratosis pilaris on back of upper arm
    Keratosis pilaris on back of upper arm
  • Keratosis pilaris on arm
    Keratosis pilaris on arm
  • Skin plugs removed from a person with keratosis pilaris
    Skin plugs removed from a person with keratosis pilaris

Treatment

KP is medically harmless,[2] but many individuals may seek treatment, as the condition can cause emotional distress.[9] Topical creams and lotions are currently the most commonly used treatment for KP, specifically those consisting of moisturizing or keratolytic treatments, including urea, lactic acid, glycolic acid, salicylic acid, vitamin D, fish oil, or topical retinoids such as tretinoin.[12] Improvement of the skin often takes months, and the bumps are likely to return. Limiting time in the shower and using gentle exfoliation to unplug pores can help.[9][13] Many products are available that apply abrasive materials, with alpha or beta hydroxy acids to assist with exfoliation.

Some cases of KP have been successfully treated with

laser therapy, which involves passing intense bursts of light into targeted areas of the skin.[14]
Depending on the body's response to the treatment, multiple sessions over the course of a few months may be necessary.

Epidemiology

Worldwide, KP affects an estimated 30 to 50% of the adult population, and around 50 to 80% of all

adolescents. It is more common in women than in men, and it is often present in otherwise healthy individuals.[12] The skin condition is prevalent in people of all ethnicities, and no particular ethnicity is at higher risk for developing KP. Although KP may manifest in people of any age, it usually appears within the first decade of life and is more common in young children.[11] In most cases, the condition gradually improves before age 30, but it can persist longer.[9]

See also

References

  1. ^
    S2CID 51715063
    .
  2. ^
    PMID 25748313
    .
  3. ^ Alai, Nili. "Keratosis Pilaris (KP)". MedicineNet. Retrieved 2008-10-06.
  4. ^ a b c d e Berman, Kevin. "Keratosis pilaris". MedlinePlus. Retrieved 2008-06-19.
  5. PMID 30066947
    .
  6. PMID 31536314
    .
  7. ^
    PMID 18856156
    .
  8. ^ "Keratosis pilaris ("chicken skin")". NHS Choices. 2017-10-24.
  9. ^ a b c d "Keratosis pilaris: Self-management". Mayo Clinic.
  10. ^ Mayo Clinic Staff. "Tests and Diagnosis". Mayo Clinic. Retrieved 2013-10-31
  11. ^ a b Alai, Nili; Arash Michael Saemi; Raul Del Rosario. "Keratosis Pilaris". eMedicine. Medscape (WebMD). and "Pathophysiology". Medscape (WebMD). Retrieved February 5, 2018.
  12. ^
    PMID 17504714
    .
  13. ^ Mayo Clinic Staff (5 January 2016). "Self-management - Keratosis Pilaris". mayoclinic.org. Mayo Foundation. Retrieved 11 April 2016.
  14. S2CID 32102128
    .

External links

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