๐ ็ธฝ็ฎ้ ๏ฝ ๐ ่ฑๆๅๆ๏ผๆฌ็ฏ๏ผ ๏ฝ ๐ ๅฎๆด็ฟป่ญฏ ๏ฝ โญ ็ฒพ่ฏ็ญ่จ
Rosacea fulminans
Rosacea fulminans
Clinical features Rosacea fulminans (pyoderma faciale) is very rare and presents with a sudden onset of papulopustules, cysts, and innumerable conglobate nodular lesions predominantly affecting the face or a single region on the face.1โ4 Sinuses
1127 Pseudofolliculitis
Pathogenesis and histologic features The pathogenesis is largely unknown although pregnancy, the contraceptive pill, and hormonal influences are likely since the condition is restricted to females.12โ14 A case associated with high-dosage vitamin B supplements has been documented.15 Cultures are invariably negative for pathogenic bacteria.
The histologic features include dermal edema and follicular abscesses accompanied by a mixed perivascular and perifollicular inflammatory cell infiltrate including lymphocytes, histiocytes, neutrophils, and eosinophils, sometimes with an epithelioid or foreign body granulomatous component.5,7,15โ17 Lobular and septal panniculitis have also been described.2
Fig. 22.206 Perioral dermatitis: grouped follicular reddish papules and papulovesicles on an eczematous and erythematous base.
Fig. 22.208 Pseudofolliculitis: predominantly seen in patients of African or Hispanic ancestry. Numerous papules and curved hairs in the beard area.