Feline Acne
Feline acne is a skin condition affecting the cats chin. Overactive oil (sebaceous) glands in the chin produce excess oil or sebum which predisposes cats to developing Feline Acne and Stud Tail. The oil, which is also called Sebum, plugs up the hair follicles in the chin which causes black heads called Comedomes to form. Secondary bacterial infection may or may not occur. Occasionally in very severe cases, the chin becomes visibly swollen but usually acne is an incidental finding. Acne occurs in male and female cats of all ages.
SIGNS OF FELINE ACNE
Black specks that look similar to flea dirt on cats chin.
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WHAT YOU AND YOUR VET CAN DO
Use Benzyl peroxide based solutions or Betadine scrub mixed with water to clean the chin and eliminate excess oil. Rinse with water and air dry.
Make a solution of white vinegar and water (50/50) and dab onto chin with a cotton ball twice daily, this helps dry out the chin area.
Avoid topical acne preparations. Cats tend to lick them off.
Edited to add--obviously I'm not a vet, and if it continues it's definitely worth getting him checked.
Antibiotics are used if bacterial infection is present
Mild cases often resolve themselves without therapy.
http://drcarol.com/v/Articles-about-cats/Feline_Acne.htmlJust google cat acne and there are lots of sites. It's a good idea to treat it--I wasn't paying attention a couple of months ago and the boy ended up with an open sore--antibiotics and salve, and a really unhappy cat. Good luck!