Alopecia in a 12-year-old girl
A 12-year-old girl presents with a rapidly expanding area of alopecia on her scalp.
Asymptomatic facial rash in a boy
An 8-year-old boy presents with an asymptomatic but unsightly facial rash.
A painful violaceous lesion on the thigh
A 48-year-old woman presents with a painful lesion on her thigh.
Sudden onset of blisters on the arms and neck
A 56-year-old woman presents with sudden onset of a bilaterally symmetrical blistering eruption on her neck and forearms.
A tender rash on the legs
A 14-year-old boy presents with a slightly tender rash on both lower legs a week after an attack of tonsillitis. He had been previously well.
An enlarging lesion on the neck
A 13-year-old boy presented with a raised, hyperkeratotic, warty lesion on his neck.
Recurrent itchy papules in a 12-year-old boy
A 12-year-old boy has developed itchy papules on the palms, soles, elbows and knees each spring for the last three years.
Sudden onset of blistering lesions in a young boy
A 12-year-old boy presents with sudden onset of blistering lesions on his arms and legs, occurring a few days after he developed a typical cold sore on his upper lip.
Asymptomatic annular lesions on the hand
A 35-year-old man has two asymptomatic, annular lesions on the dorsum of his left hand, which have slowly expanded over the past three months.
Lifelong irregular pale patches
A man presents with a lifelong history of asymptomatic irregular pale patches outlined by a pink blush localised to his shoulder and back. These failed to react to dermographism. What is the differential diagnosis?