Many KP bumps contain an ingrown hair that has coiled. This is a result of the keratinized skins "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 intellectual disability, neuro-cardio-facial-cutaneous syndromes, RASopathies, ectodermal dysplasias, and certain myopathies. Diagnosis
Physicians can often diagnose KP simply by examining the skin without specialized tests, but a dermatologist can use dermoscopy to confirm the diagnosis and assess if a person with KP is responding to treatment. Physicians often consider family history and the presence of symptoms when making the diagnosis. 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. Differential diagnosis
Several medications that can cause a skin eruption similar to KP include cyclosporine, BRAF inhibitors, and tyrosine kinase inhibitors. 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.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.
Although KP may manifest in persons of any age, it usually appears within the first decade of life and is more common in young children. In most cases, the condition gradually improves before age 30, but it can persist longer. See also
Ichthyosis linearis circumflexa

References
External links

The American Academy of Dermatology
The American Osteopathic College of Dermatology  - Article on keratosis pilaris