Skin infections

Question 1

where does skin infections arise at high rates

Answer 1

in humid and hot conditions

poor populations

Question 2

features of Staphylococcus aureus

Answer 2

impetigo: in subcorneal layer of epidermis
golden coloured crust
bullous impetigo - due to toxin

folliculitis: in hair follicle of mouth

ecthyma: full thickness of epidermis
adherent crust

boil: abscess of hair follicle
carbuncle: abscess of several adjacent hair follicles

staphylococcal scalded skin syndrome - due to toxin

Question 3

what is caused by Treponema pallidum?

presentations

Answer 3

syphilis

primary phase: chancre(painless ulcer) at inoculation site
secondary phase (6-12weeks): generalised rash & lymphadenopathy
- maculopapular rash, condyloma lata, in palm and soles
latent phase: no symptoms
tertiary phase(years): bone lesion, gummatous skin lesions, thoracic aneurysm, neurosyphilis(dementia, neuropathy)

Question 4

types of herpes simplex virus

Answer 4

type 1: oral herpes

type 2: genital herpes

Question 5

features of herpes simplex

Answer 5

vesicular rash (2 weeks)

Question 6

when does herpes simplex reappear

Answer 6

stress
sun exposure
pneumonia

Question 7

what is caused by Varicella zoster?

presentations & common sites

Answer 7

chickenpox

vesicle, small punched-out erosion
unwell, fever, sore throat-> rash (2-3 weeks)

Question 8

what occurs if herpes simplex reactivates in dorsal root ganglion after chickenpox?

Answer 8

herpes zoster = shingles

rash down one dermatome -> blistering

Question 9

what is caused by Trichopytum? - features

where can it occur?

Answer 9

grow in keratin - long hyphae

Tinea ______
- head, face, hand, nail, groin, foot

Question 10

features of Scabies

common sites

Answer 10

burrow in epidermis surface

S shape, black dot it the end, cotton-like

Question 11

how does rash in Treponema pallidum and Herpes simplex differ?

Answer 11

maculopapular rash vs vesicular rash