This woman has these lesion 10 days after treking through the country side.

a. What is this lesion?

b. What is the underlying cause?

c. What ocular signs may be present?

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Answers:
 
This woman has these lesion 10 days after treking through the country side.

a. What is this lesion?

Erythema chronicum migrans in Lyme's disease.

The skin lesion typically occurs 5 to 7 days following bites from deer tick. The initial lesion is either nodular or macular but quickly form an expanding annular lesion with a red porder and partial central clearing.
 

b. What is the underlying cause?
Lyme disease is caused by the spirochete Borrelia burgdorferi. The vector is the deer tick which injects the bacteria into the host through its bite.


c. What ocular signs may be present?

    • Conjunctivitis
    • Episcleritis
    • Scleritis
    • Keratitis
    • Iritis
    • Vitritis
    • Choroiditis
    • Vasculitis
    • Optic neuritis
    • Extra-ocular muscle palsy
    .