This 15-year-old boy complained of an painful rash in the left axilla which developed overnight. He had slept with the lights on as he was in the middle of preparing for his annual examination. On examination the lateral wall and medial wall as well as the entire vault of his left axilla showed acute eczematous changes and scaling at one site. There was no systemic discomfort of any kind. He was treatd with iced saline soakes and topical steroid antibiotic combination. The lesions completely cleared after a week. He lived in an area endemic for blister beetles which are attracted by lights left on during the evening.
red scaly crusted and eroded confluent plaques with well demarcated borders