Case based quiz for dermatology
1 / 6
A 25-year-old female presents with a pruritic rash on her flexor surfaces, such as the wrists and elbows. The rash consists of erythematous papules and vesicles arranged in linear patterns. What is the most likely diagnosis?
Scabies is a parasitic infestation caused by the mite Sarcoptes scabiei. It commonly presents with intense itching and a characteristic rash, often in a linear distribution. The flexor surfaces of the wrists and elbows are classic locations for scabies infestations
2 / 6
A 20-year-old male presents with well-demarcated, round, scaly patches with central clearing on his trunk. The lesions have an annular appearance. What is the most likely diagnosis?
Tinea corporis, or ringworm, is a fungal infection of the skin characterized by annular, scaly patches with central clearing. It is commonly caused by dermatophytes
3 / 6
Which of the following is a characteristic feature of erythema multiforme?
Erythema multiforme is characterized by target-like or iris lesions with concentric rings of erythema and central clearing.
4 / 6
A 45-year-old woman presents with multiple, firm, hyperpigmented papules on her face. The lesions are symmetrically distributed, and she reports a history of sun exposure. On examination, there is no evidence of comedones. What is the most likely diagnosis?
Seborrheic keratosis is a benign epidermal tumor that commonly occurs on sun-exposed areas of the skin. It presents as hyperpigmented, well-demarcated papules with a stuck-on appearance.
5 / 6
Which dermatological condition is associated with the ‘string sign’ seen on dermoscopy?
The ‘string sign’ is a dermoscopic feature seen in dermatofibromas, characterized by a central white structure resembling a ‘string’.
6 / 6
Which systemic condition is associated with the development of livedo reticularis on the skin?
Livedo reticularis is often associated with antiphospholipid syndrome, an autoimmune disorder characterized by the presence of antiphospholipid antibodies
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