Question 1 - Explanations
Contact dermatitis is a type of inflammation of the skin from exposure to allergens or irritants which can take several days to weeks to heal.
Urticaria, also known as hives, is a kind of skin rash with red, raised, itchy bumps which usually fade within minutes or hours. As this description is not consistent with the rash or patients history this cannot be correct.
Erythema nodosum is caused by inflammation of the fat cells under the skin, resulting in tender red nodules or lumps that are usually seen on both shins. As this description is not consistent with the rash or patients history this cannot be correct.
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