K
Kaposi Sarcoma
Etiology: HHV-8
Types:
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Classic: often affects middle aged men of Mediterranean or Eastern European descent
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Endemic: occurs in sub-Saharan Africans
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Iatrogenic: due to immunosuppressive drugs (esp. kidney transplants)
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AIDS-associated: most common
Appearance: red, purple, or brown patches or nodules
Location: lower extremities (esp. classic type), when disseminates it spreads to mouth, lungs, liver, other organs
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Kawasaki Disease
Etiology:
Medium-vessel vasculitis
Description: polymorphous / morbilliform (measles like) / targetoid skin lesions -> desquamating rash (peeling of extremities)
Location: trunk and extremities
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Keloid
Etiology:
Cause: dysregulation of the normal healing process resulting in excessive production of collagen, elastin, proteoglycans, and extracellular matrix proteins
Description: Purplish-red, firm, smooth, and raised; can occur years after injury and grows beyond the initiating wound area
Keratoacanthoma (KA)
Etiology: form of SCC (UV exposure)
Appearance: flesh-colored or pink dome-shaped nodule with central keratin plug
Location: face, neck, dorsal of upper extremities
Tx: excision
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Keratoderma Blennorrhagica
Etiology:
Associated with: reactive arthritis (Chlamydia)
Description: painless desquamative psoriatic-like papulosquamous eruption
Location: commonly found on the palms + soles but may spread to the scrotum, scalp, + trunk
Keratoelastoidosis Marginalis
Etiology:
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Keratosis Pilaris (KP)
Etiology:
Cause: abnormal keratinization of the upper portion lining of the hair follicle
Description: ‘goosebump’ or ‘chicken skin’ appearance
Location: most common on posterior arms
Keratosis spinulosa
Etiology:
