Category Archives: Bacterial Infections

Bacterial Skin Diseases

Ecthyma

History

        A 3-month-year old female infant presented with a solitary small oval superficial punched-out ulcer with crusted base involved the neck flexure of 10 days duration. Oral cephalexin and topical fusidic acid cream for 10 days has cured this ulcer.

Lupus vulgaris

History

         An 8-year-old girl presented with a  slowly growing unilateral well-demarcated reddish-brown scaly indurated plaque involved one cheek and the nose of more than one year duration. Tuberculin test was positive and skin biopsy revealed a tuberculoid granuloma.

Erythrasma

History

         A 40-year-old man presented with asymptomatic, well-demarcated, red-brownish patches involved both axillae and both crural areas of many months duration. A characteristic coral red flourescence under wood’s lamp was seen.

Impetigo contagiosum

History

          A 4-year-old boy presented with asymptomatic, red crusted patches involved the periorbital region of three days duration. An oral cephalosprine suspension (Cefodox) plus fusidic acid ointment for one week gave excelllent result.

Impetigo contagiosa

History

          This 2-year-old baby presented with multiple erythematous patches covered with yellow crusts that spread quickly within 3 days to involve the periorificial areas around the mouth and nose. The following features  are good clues to the diagnosis of impetigo contagiosum which commonly occurs in children:
1. Periorificial distribution
2. Short duration
3. Honey-coloured crusts.

Ecthyma

History

         A 48-year-old man had been stung by a wasp. He immediately developed painful and tender red swelling. Three days later a small ulcer developed. After 10 days he presented with a painful and tender punched out ulcer with red border and purulent base. Swab taken from the ulcer margin showed S. aureus on culture.