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March 1960

Polyporous Comedonal Cyst

Author Affiliations

Hollywood, Calif.

AMA Arch Derm. 1960;81(3):458-460. doi:10.1001/archderm.1960.03730030116020

Sebaceous and epithelial cysts are common complications of acne. Another type of cyst seen in acneform eruptions is a polyporous comedonal cyst (Fig. 1A).

A polyporous comedo is a blackhead with multiple openings.1 Ocassionally, the sinusoidal connecting channels of a polyporous comedo become dilated and form a cyst.

Report of Cases 

Case 1.—  A 45-year-old man had had polyporous acne on his face since his youth. Numerous acne scars, monoporous comedones,1 and polyporous comedones remained on his face. On the left side of his neck, below his left ear, was a small polyporous comedonal cyst which had been present for years (Fig. 1A). The patient requested that it be removed.Before the cyst was excised, a small hypodermic needle (#25) was inserted through the two connecting comedones which surmounted the cyst (Fig. 1B).Serial sections were made through the biopsy excision (Fig. 2, A-F). Figure 2A shows the