Perianal Rash in Children: Diagnostic Approach and Management

Introduction to Perianal Rash Causes

The British Journal of Dermatology recommends considering lichen sclerosus in young girls with perianal rash, characterized by bright red to porcelain-white lesions, often with striking ecchymosis, and commonly causing constipation due to painful fissuring 1
Perianal lichen sclerosus occurs in 30% of female cases and can occur with or without vulval involvement, according to the British Journal of Dermatology 1
The presence of ecchymosis, fissuring, and constipation in a young girl should prompt consideration of lichen sclerosus, as noted by the British Journal of Dermatology, though the Koebner phenomenon means trauma can trigger or aggravate the condition 1
Perianal lichen sclerosus is extremely rare in males, as reported by the British Journal of Dermatology 1

Ecchymosis with or without fissuring should prompt consideration of lichen sclerosus and evaluation for abuse, though lichen sclerosus itself can cause these findings, according to the British Journal of Dermatology 1
Fever, swelling, or signs of systemic infection require urgent evaluation for abscess or cellulitis, as suggested by a medical insights journal, although this fact is not preferred due to its source, a better source is needed 2
However since 2 is from 'Praxis Medical Insights' we will ignore it and look for other sources.

The British Journal of Dermatology suggests referring patients with lichen sclerosus to dermatology or pediatric gynecology for specialized management 1