Picture of Dermatitis From Common Carpet Beetle

The common carpet beetle is not common in modern well-sanitized homes, and even where it is abundant, effects from it are not common. Nevertheless, on occasion, the crawl of the insect on an unwary individual leaves its marks as wheals, papulovesicles, or bullae. This figure shows just such an event in the form of large, flaccid blisters. The three lesions in a line record the walk of a creature and the deposition of its irritant principle.
Source: Color Atlas of Pediatric Dermatology
Samuel Weinberg, Neil S. Prose, Leonard Kristal
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