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Feline Acne and similar conditions
Feline acne or dermatophytosis (ringworm) or demodecosis
Feline Acne
Feline Acne
Feline acne
also see Ringworm
also see demodecosis
also see Skin problems
Feline Acne and similar conditions
Feline Acne and similar conditions
Question: Hi Dr. Richards,
My 13 year old cat has been diagnosed with cat acne. She's had it for
over a month. Recently she became ill with a fever and general malaise
(although eating habits and litter box were fine). After exhaustive
tests including blood work, urine analysis and xrays, everything came up
normal and the vet says it's a mystery. The doctor gave her Clovamax
(antibiotic) drops and she became much better after three days.
I have a few questions: Is it possible that one of the acne sores
became infected, either by food or just hygiene, and thus caused her to
have a bacterial infection? And second, the shampoo you recommend on
your website, benzoyl peroxide, where can I buy that and is there a
brand name? Is it safe to wash her chin with hydrogen peroxide or baby
shampoo? Any other things you can suggest is appreciated. She's
currently on an ointment the vet gave us. It works so-so.
Thanks again for all the great advice you give us,
Sincerely, JeanneAnswer: Jeanne-
There are several conditions that can resemble feline acne. These include Malassezia infection (yeast infection) of the chin, demodectic mange, deep bacterial follicle infections, usually with Staph bacteria or Pasteurella bacteria, ringworm (dermatophytosis) and immune mediated disease, especially eosinophilic granuloma complex. Several of these conditions are a little more likely in older cats, especially the bacterial and yeast infections which seem to take advantage of even minor decreases in immune system competency. Skin scrapings can sometimes reveal yeast infections or demodectic mange. Fungal cultures can rule out ringworm. Sometimes biopsy of the affected area is necessary to identify an underlying cause when acne is not responsive to therapy and simpler tests don't provide a diagnosis.
When antibiotics are helpful it is recommended that they be used for 21 days since the area is favorable for bacterial growth and the infections can be relatively deep, making it take a little longer for a good effect. In Small Animal Dermatology, 6th Ed. (Scott et al.) the authors recommend using Espom salt soaks or compresses to help draw out infection. They recommend 2 tablespoonfuls of Epsom salt per quart of water and applying a very moist warm compress for 5 to 10 minutes. We haven't actually tried this very often because my clients tend to think their cat wouldn't tolerate it, but it is an option for enhancing the effect of antibiotics or other therapy.
A number of topical medications have been advocated for feline acne but we have had the best luck with 2% mupirocin (Bactoderm Rx) applied twice a day and benzoyl peroxide shampoos (2.5% usually) which are marketed under several names, including Pyoben (tm) and Oxydex (tm). There are benzoyl peroxide gels made for people but concentrations over 5% are potentially irritating to cats so be careful using any of these.
The best antibiotics for feline acne are probably amoxicillin/clavulonic acid (Clavamox Rx) and cephalosporins (Keflex Rx, Cefa-Tabs Rx). Fluoroquinolones like Baytril (Rx) or Zenoquin (Rx) are usually effective but I like to try not to use these antibiotics too frequently since we rely on them to be effective for life threatening infections. Some vets like erythromycin or clarithromycin but we have not tried these antibiotics.
If there is an immune mediated component to the inflammation, or in rare instances when the inflammation gets so advanced that it is self supporting and must be controlled to allow antibiotics to penetrate the lesions, it can be helpful to use prednisone or other corticosteroids to aid in controlling the acne. Most of the time this isn't going to be necessary, though.
Good luck with this. Since there was a good response to antibiotics it might be a good idea to ask your vet about using them for a longer time period to see if that would eliminate the problem.
Mike Richards, DVM
2/12/04
Feline Acne or dermatophytosis (Ringworm) or demodecosis.
Question: Dear Dr. Mike:
I am having a problem with my cats and what looks to be feline acne. I have
been to two vets and a dermatology specialist. It started when I brought
a stray cat into my home and kept her in a separate bedroom for one month
until I found her a home. She had what I thought was flea dirt under her
chin. Shortly after she left and my cats entered the room, they also came
down with the black spots. Six months later and about $1000.,no one seems
to know what is causing this. I also noticed what appeared to be flying
gnats in the window of the room where the stray cat was. These were not in
any other window in the house. The Dermatologist says this is only
coincidence. She recommends continuing the lime dips even though it is
causing one cat to scratch so bad that she is bleeding under the chin. This
has been going on for six months. The one cat who appeared to be clearing
up came down with another bad episode after the first lime dip. They all
seem to be scratching more after the dip which is the most recent treatment
attempted.Facts:
Ringworm test done
Skin scrape
Biopsy - showed that it was feline acne (is feline acne contagious & does
it itch?)Treatments to date:
Nolvassan wash with Quadritop ointment
Steroid ointment
Steroid pills
2 week interval shots
Bathing in 2 shampoos (demodex & sebolux)
LymDyp with Humilac (seemed to make it much worse)
Floucitonide cream (seemed to make a little better)Cats:
3 related, 4 not
Ages 3-17
They do not go outdoors
One cat who is 17 is away from the others, she did not come down with the
black spots
All have shots & vaccinations and have been tested for Aids, lukemia, etc.
I read the other cases on your website but it seems that I have already
tried all the solutions possible. Can you please offer some assistance.Thank you, Kimberly
Answer: Kimberly-
There are only two contagious diseases that complicate, or mimic, feline
acne that I know of. They are ringworm (dermatophytosis) and demodecosis.
Both of these are sometimes itchy conditions. Ringworm is found through
culture of hairs (sometimes takes more than one attempt) around the
affected area and demodecosis shows up in biopsy samples but it sometimes
takes more than one sample to find it. We had a case in which it took three
attempts to biopsy, taking two or three samples each time, to find the
Demodex organisms in a group of infected cats. Some cats have eosinophilic
granuloma complex that resembles feline acne but these are supposed to be
distinguishable by examination of biopsy samples. Eosinophilic granuloma
complex can be caused by allergies and flea bite hypersensitivity. If the
new cat brought fleas with it, this might be a consideration.Feline acne is usually treatable by topical treatment only. There are a
number of things that people use for it, with benzoyl peroxide shampoos,
vitamin A ointment (Retin-A, Rx), metronidazole gel and mupirocin ointment
being the most common recommendations. When topical treatment alone is not
sufficient, the use of systemic antibiotics or corticosteroids is sometimes
necessary. Most cats will respond to corticosteroid treatment within a
couple of weeks. Some vets have tried isotretinoin (Accutane Rx) in cats
but according to "Muller and Kirk's Small Animal Dermatology, 6th ed" the
success rate is only about 33% to this medication and it is pretty expensive.If you have not contacted the dermatologist to report that treatment does
not seem to have been successful, that would be a good thing to do. The
dermatologist may suggest further testing, especially with the apparent
contagiousness and the persistence of this problem or she may feel that it
is reasonable to try some of the other treatments to see if they are more
effective.Demodecosis in cats is usually responsive to lime sulfur dips, at least
according to the textbooks. Our clients do not like the product much,
though. Alternatives are amitraz (Mitaban Rx) dips (we used 1/2 of the dog
strength), selamectin (Revolution Rx) and ivermectin, although I do not
know a dosage for this use in cats. Ruling out the possibility of
demodecosis may be the reason the lime sulfur dips have been recommended
but I can't say that for certain. It doesn't seem successful, so it may be
reasonable to try another treatment at this time if this is something the
dermatologist is concerned about.Good luck with this. If you do not have success after talking to the
dermatologist, or talking your vet into talking to the dermatologist for
you (sometimes works better) it may be necessary to redo some of the
testing. I know that is a bummer, especially with the costs involved and
having already paid for the tests once, but it is sometimes the only way to
find a diagnosis.Mike Richards, DVM
1/26/2001
Question: Dear Dr Mike:
My ginger and white male cat has minute black spots under his chin
(his chin is white) Someone told me that these are like black heads. Is
it possible?
Answer: Suzanne-
Cats get acne fairly frequently, so this is possible. However, yellow and
light colored cats sometimes get pigmentary changes that are small black
spots, so this is possible, too. Your vet can help you tell these
conditions apart.
Mike Richards, DVM
12/28/2000
Question: I am a subscriber to your service. My cat, Baxter, has an ongoing problem with feline acne on his chin. The first time it happened, my vet gave him a steroid shot which cleared the acne up in a day or two. However, it lowered Baxter's immune system and ear mites multiplied in his ears, causing an infection. And the acne returned in about a month. I have tried all the recommended remedies, benzoyl peroxide wash and ointment, regular peroxide, vinegar, warm compresses, but still the acne continues. What is causing him to have this problem and how do I treat it? He does seem to have a weakened immune system. How can I bolster that?
Anne
Answer: Anne-
Unfortunately, I am not aware of a consistently effective approach to the problem of immune system deficiency problems, so I can't help with that portion of your question.
The current favorite topical treatment for feline acne among some veterinarians is 2% mupirocin (Bactroban Rx) ointment, used twice a day for three weeks. A published study on this treatment indicated excellent success in 60% of the cats treated, good success in 36% and one cat that developed an allergic reaction to the medication and had to be dropped from the study, making the failure rate 4%.
When feline acne does not respond to topical treatment, there are a couple of things to consider. The first one is whether or not it really is feline acne, or if it is one of the conditions that can mimic feline acne, such as ringworm, contact allergies, food allergies, yeast infections or demodectic mange.
If this is feline acne and topical treatment isn't working, the best approach is to culture one of the pustules and then choose an oral or systemic antibiotic based on the culture and sensitivity results. If this isn't successful, then it may be helpful to try isotretinoin (Accutane Rx). One of the recommended dosage schedules for this medication is 10mg per cat once a day, which is convenient because the medication comes in a 10mg capsule. An alternative is to continue to pursue the diagnostic process
and consider a skin biopsy. This can be helpful in differentiating deep acne lesions (furunculosis) from other infectious/inflammatory conditions and that can help in determining the best treatment.Hopefully, one of these things will help.
Mike Richards, DVM
11/6/2000
Q: My cat has some kind of black stuff that almost looks like dirt under his chin. It's not from fleas, and I can't wash it off. Some days it's worse than others. Do you have any idea what this could be? I keep his food and water dishes clean. Thanks.
A: You cat probably has feline acne. It produces this sort of black debris in many instances and is usually confined to the chin.
Your vet can confirm this and make sure nothing else is wrong. Treatment may require antibiotics or corticosteroids but often it is possible to treat just by cleansing with benzoyl peroxide shampoo a couple of times a week.
There are a few cats in which this is a symptom of contact allergy to plastic food bowls. In that case, using a ceramic or stainless steel food bowl would be helpful.
Mike Richards, DVM
Last edited 10/31/04
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