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Skin Conditions and Diseases


This is very much a work in progress - please be patient and check back soon!


All about pattern recognition.




  • papulo-
  • pigmented
  • vesicular and
    bullous diseases
  • warty
  • wounds

  • skin
  • systemic

Pigmented Lesions

vesicular and bullous diseases




  • porphyria
  • bullous impetigo - S. aureus
    • infants and youn children; can cause scaled skin syndrome if extensive
  • bullous erysepilys

Skin Infections

Skin is a natural barrier to infection. However, it frequently succumbs to attack by bacteria, viruses, parasites, and insects.


Skin infections are more common in people with:

  • young or elderly age
  • at-risk environment
  • lowered immune system
  • concurrent diseases or conditions
  • medications (antibiotics, corticosteroids)


Infection History and Physical


  • time and course
  • preveious skin disease and trauma
  • contact with infected individuals
  • recently used medications
  • other symptoms (fever, malaise, etc)

physical exam:

  • anatomical location and distribution
  • follicular or non-follicular
  • concurrent cutaneous or systemic disease
  • constitututional symptoms
  • lymphadenopathy, lymphangiitis, or edema


Bacterial Skin Infections


  • Staphylococcus aureus
    • most likely to cause disease
    • local infections: folliculitis, furuncles, carbuncle, impetigo, ecthyma, cellulitis
    • toxin related: scalded skin syndrome
    • secondary infections
  • Streptococcus
    • local infections: impetigo, cellulitis, erysiplas, NF
    • toxin related: scarlet fever, toxic shock syndrome


common viral skin infections





fungal infections (tinea)

affinity for keratin of skin, hair, and nails

named for site of involvement - tinea capitis, pedis, cruris, manum, facei, corporis, barbae, unguim (aka onychomycosis)

various species

yeast infections include Candidiasis and tinea versicolor

often scaling, with occasional pustules


tinea capitis can be varied in what it looks like

  • alopecia (hair loss) is a good clue its a fungus
  • have a high index of suspicion

management of fungal infections

  • establish correct diagnosis
  • KOH exam (easy to do where you are)
  • Wood's light (a single wavelength) that lights up porphyrin
    • negative doesn't exclude fungi
  • fungal culture (takes a couple of weeks)

treatment of fungal infections

  • topical antifungals (limited infections)
  • clotrimazole, econazole, ketaconazole, terbenafine, ciclopirox)




lamisil is taken systemically for 3 mothns, with ~80% experiencing cure


hand, foot, and mouth disease


molluscum contagiosum