๐ ็ธฝ็ฎ้ ๏ฝ ๐ ่ฑๆๅๆ๏ผๆฌ็ฏ๏ผ ๏ฝ ๐ ๅฎๆด็ฟป่ญฏ ๏ฝ โญ ็ฒพ่ฏ็ญ่จ
Acne necrotica
Acne necrotica
Clinical features Acne necrotica (necrotizing lymphocytic folliculitis, acne necrotica varioliformis, acne frontalis, acne pilaris) is a rare disease characterized by chronic recurrent crops of variably pruritic or tender pea-sized erythematous follicular papules which undergo central ulceration and heal with the formation of disfiguring varioliform scars.1โ3 Comedones are not a feature and the disease must not be considered a variant of acne vulgaris. It usually involves the anterior hairline and temporal region of the scalp, seborrheic areas, nose, cheek, upper chest, and interscapular area.1,4,5 There is a slight predilection for males and most patients are in the fourth and fifth decades.3
1109 Scarring alopecias
A
B
differentiated by the extensive damage of the hair follicles present in the latter.1
Fig. 22.169 Erosive pustular dermatosis: note the eroded and edematous appearance as a consequence of surgery. Courtesy of P. Reygagne, MD, Centre Sabouraud, Paris, France.