Comedo and Acne Pseudocyst

Pseudocyst of auricle

• Pseudocyst of auricle (external ear) follows trauma.

Pseudocyst of auricle

Comedones are the skin-coloured, small bumps (papules) frequently found on the forehead and chin of those with acne. A single lesion is a comedo. Open comedones are blackheads; black because of surface pigment (melanin), rather than dirt. Closed comedones are whiteheads; the follicle is completely blocked.

Rupture of a cyst

• Combination oily and dry mid-facial skin
• The contents of the cyst may penetrate the capsular wall and irritate surrounding skin.
• The area of tender, firm inflammation spreads beyond the encapsulated cyst.
• Sterile pus may be discharged.

Secondary infection

• A ruptured cyst may infrequently become secondarily infected by Staphylococcus aureus, forming a furuncle (boil).