Diagnosing a Suspicious Skin Macule

Lentigo maligna
An 81-year-old woman presents with a poorly circumscribed macule with variegated pigmentation. Explore the key diagnosis that must be excluded in such cases.
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Puzzling Pruritic Papules

Scabies
A 46-year-old woman presents with intensely itchy papular lesions in her axillae, groin, and buttocks. Explore the differential diagnosis for this pruritic rash.
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When Antibiotics Leave a Mark

Minocycline
A patient develops skin hyperpigmentation after antibiotic treatment. Can you identify the causative drug? Learn about this common side effect.
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Mysterious, Painless Shin Lesions

Necrobiosis lipoidica diabeticorum
A patient presents with non-pruritic, painless lesions on their shins. Explore the differential diagnosis and key features of this classic skin condition.
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A Deceptive Plantar Lesion

Malignant melanoma
A patient presents with a lesion on the sole of their foot and associated inguinal lymphadenopathy. Explore the differential diagnosis for this challenging case.
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The Great Imitator’s Rash

Secondary syphilis
A patient presents with a symmetric, dusky red, polymorphic papulosquamous rash. Can you identify this classic dermatological manifestation?
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Sudden Skin Lesions: What to Look For?

Seborrheic keratoses
Explore a case of multiple skin lesions developing over several years. Learn about the differential diagnosis and the potential link to underlying conditions.
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A Mysterious Mouth Rash

Secondary syphilis
A patient presents with pseudomembranous lesions and erosions on the tongue, palate, and tonsils. Explore the differential diagnosis for these oral findings.
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Skin Lesions in an Immigrant

Leprosy
A recent immigrant from Pakistan presents with non-pruritic, non-hypoesthetic skin lesions. What is the differential diagnosis? Explore this classic case.
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Beard Bumps and Bald Patches

Tinea barbae
A patient presents with pustules and hair loss in the beard area. Explore the differential diagnosis and key features of this fungal infection.
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