Dermatitis of Unknown Origin

A 60-year-old male patient, a garbage collector, presented with a maculopapular rash that progressed to pruritic, scaly plaques with signs of impetiginization secondary to constant scratching. He denied any significant past medical history or drug allergies. He had previously been treated for contact dermatitis and tinea manuum without clinical improvement.
Dermatitis de origen desconocido:
Paciente masculino de 60 años de edad, dedicado a la recolección de basura, que inició con exantema maculopapular, el cual evolucionó a placas escamosas pruriginosas, con datos de impetiginización secundaria al rascado constante. Niega antecedentes patológicos de importancia y alergia a medicamentos. Fue tratado previamente como dermatitis de contacto y tiña manuum, sin presentar mejoría clínica.

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A 52-year-old man presented with a 20-minute history of chest pain radiating to the left shoulder and neck, associated with dyspnea and diaphoresis. He had a history of hypertension, long-term smoking, and a sedentary lifestyle. On physical examination, bibasilar crackles were noted on lung auscultation. An electrocardiogram (ECG) was performed in the primary care setting, and the patient was promptly referred to the emergency department.

A 28-year-old woman presented with a 3-day history of intense pruritus over the lower back. She reported no recent travel or exposure to new environments. She cares for a small kennel with approximately eight dogs rescued from the streets. Physical examination revealed multiple small vesicles, some clustered and others scattered, predominantly involving the lumbar region and the left gluteal area.

A 4-month-old male infant presented with skin lesions localized to the chin for the past 3 days. Physical examination revealed multiple small pustules with surrounding inflammatory signs on the chin, along with a few scattered papules on the chest.