Experienced and professional animal trainer provide their insights in answering this question :
A. This sounds as though it could possibly be allergies either due to environment or possibly food. You can try switching her to more of a hypoallergenic formula. If that doesn’t help, next step would be to see the vet who may prescribe Benadryl specific to your dog’s weight.

How to Identify Common Pet Problems ?

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The most common clinical signs associated with pyoderma are papules or pustules that form on the skin. These lesions often look similar to pimples in humans. They are most often red and raised, with a white pus-filled center. Other signs include circular crusts, dry or flaky patches of skin, hair loss, and itching.
Pests and Parasites

Fleas, mites, and ticks can cause irritation, exposing your dog to bacteria, yeast, and fungal infections. Demodex mites, walking dandruff, flea allergy dermatitis, and sarcoptic mange (caused by the Sarcoptes scabiei mite) can all cause rashes on your dog`s skin, including her belly and groin area.

Your dog may have puppy pyoderma if you see red bumps in the armpits, groin and/or on the abdomen. These red bumps can scab over and scale. Puppy pyoderma can make your dog slightly itchy, but pups with puppy pyoderma are usually otherwise in good health.
Folliculitis is a very common skin condition of dogs that often affects the belly and causes red and raised lesions. It can be linked to a number of medical issues including allergies, acne and hormonal disorders. As well as red and raised skin, we may see some hyperpigmentation and minor swelling.
Pustules are small lesions on the skin filled with pus. They are easily identified upon physical examination as red bumps with white or yellowish centers. If severe, they may be accompanied by additional signs and symptoms surrounding the lesion, such as pain, tenderness, swelling, soreness, and warmth.
In dogs, most granulomatous or pyogranulomatous skin lesions appear as papules, nodules, and/or plaques. The lesions may be solitary or multiple, and localized or generalized. They also can be alopecic or haired, and ulcerated, firm or fluctuant, and can vary in size from a few millimeters to several centimeters (4,5).
Infected male dogs may have abnormally sized testicles (swollen or shrunken). Other signs observed with canine brucellosis include infertility, anorexia, weight loss, pain, lameness, incoordination, swollen lymph nodes, and muscle weakness.
If there are no cuts or open sores on the groin, you may also apply non-scented lotion or hydrocortisone cream to the affected area. Do not apply hydrogen peroxide or any other substance that will sting or irritate the skin. In some cases, applying oatmeal on the afflicted area also helps.
Rashes around a dog`s private areas or groin commonly result from food or environmental allergies, bacterial and fungal infections, and parasite infestations. Other reasons for the rash can include hormonal imbalances, trauma from excessive licking, and heat rash.
You may notice a very fine rash or just the itching at first. Over time the skin becomes very red, there is hair loss and flaking skin. Areas where hair is thinner (ears, elbows, ankles, belly) tend to be the most severely affected. However, some dogs may have a different pattern or no symptoms at all.
All dogs and cats can get sebaceous cysts, whether purebred or not. The cysts look like enclosed small bumps that stay whitish in color and are raised from the skin. When touched, they feel like small circular or oval lumps under the skin. If your pet has a sebaceous cyst, you will notice a raised bump.
Patches of ringworm may look like a grey, scaly patch in some dogs, but more like a red lesion in others. You may see some hair loss or patches of broken hair. But lots of other (more common) skin conditions look very similar. Young, elderly, or long-haired dogs are more commonly affected.
Milia are small cysts that form on the skin. They are also known as “milk cysts.” Milia form when a protein called keratin gets trapped under the skin. The tiny bumps look like whiteheads, but they are not acne. Unlike acne, they don`t develop in a pore and are not red or inflamed.
Symptoms of hives include: raised circular wheals that look like mosquito bites – these are red on the outer rim and white in the centre, and each wheal lasts for around 2 to 4 hours (rarely up to 24 hours). Wheals appear in batches or clusters, and as one batch fades away a new batch appears.
The rash often looks red, but this may be less obvious on brown or black skin. The symptoms of heat rash are often the same in adults and children. It can appear anywhere on the body and spread, but it cannot be passed on to other people. Heat rash appears as raised spots that are 2mm to 4mm across.
Panniculitis is a localized inflammation of the tissues under the skin, causing a firm swelling (nodule) that may ulcerate and drain fluid.
Cutaneous histiocytosis (CH) is a benign (non-cancerous) condition in dogs caused by a proliferation of a type of body cell called histiocytes. These cells are part of the body`s immune surveillance system. They function to take up and process antigens (foreign materials) such as pollens and microorganisms.
In some cases where Pyoderma is not caught and treated soon enough, bacteria can spread from the infected area into the bloodstream and colonize internal organs, which is often fatal.
If your veterinarian suspects a food allergy as the underlying cause for the pyoderma, they may recommend a food trial with a low allergen dog food. The most common dog allergies are to proteins including chicken and beef. Contrary to popular belief, grains are not common causes of allergies in dogs.
Discospondylitis occurs when bacteria or fungi reach the intervertebral disks. There are several ways that this can happen: Hematogenous (blood-borne) spread. In this situation, bacteria or fungi enter the bloodstream through a wound or infection.
Leptospirosis is a bacterial disease that affects humans and animals. It is caused by bacteria of the genus Leptospira. In humans, it can cause a wide range of symptoms, some of which may be mistaken for other diseases. Some infected persons, however, may have no symptoms at all.
Soothing shampoos (aloe or oatmeal based). Wiping off your dog`s paws and belly after a walk, to remove pollen and other potential allergens. Hydrocortisone cream is usually okay to apply for a few days directly on the rash. Just be sure your dog doesn`t lick and ingest it (an Elizabethan collar can help).
Jock itch is an itchy rash, often on the groin and inner thighs. Jock itch is a fungal skin infection that causes an itchy rash in warm, moist areas of the body. The rash often affects the groin and inner thighs and may be shaped like a ring. The condition is also called tinea cruris.
Vaginitis is the medical term referring to inflammation of the vagina or vestibule. It can appear in any female, spayed or intact, and at any age. Even dogs under a year of age can be affected for unknown reasons and it often resolves after their first heat cycle.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My dog likes to walk around trees and bushes. I noticed today a rash on his back in a straight line and his hair is gone in the area. Help?
ANSWER : A. If you live in a brushy or wooded area it is possible that your dog may have come into contact with an irritant such as poison oak or poison ivy. These can spread to people, so care should be taken when handling the area by using gloves and washing hands. You should also prevent your dog from licking or scratching at the area to prevent the spread of irritation. Topical ointments for pets can be used to treat oak/ivy infections.

Other causes such as allergies, cuts and scrapes, or even external parasites can cause redness as well. Ticks and fleas are common in wooded and brushy areas, so making sure your pet is on a preventative for these is important.

If the rash appears to have any cuts, scrapes, open sores, hair loss or spreads, then making an appointment with your vet is best. Your vet can take a sample of the area to look for any more serious infections causing the redness.

Q. My dog has red spots on his bottom what could it be ? I gave him foam fast relieve bottle .
ANSWER : A. Red spots on the body and rear may be cause by a number of things. Rashes can be caused by allergies, or even irritation if the redness is around the anus (such as with diarrhea or constipation). Rashes due to allergies may cause the area to be itchy or red and may be cause by environment or certain food ingredients. It is best NOT to give your pet any over the counter medications unless instructed by your vet as they may be the wrong treatment or even harmful if given to your dog. Stopping him from licking and chewing at the area with the use of an Elizabethan (cone) collar may help, and a trip to the vet is best if the redness continues for more than a day or worsens.

Q. My Pug’s nose is red and he doesn’t have a yeast infection. He is taking medicine for that. It seems to get worse when he goes outside. Any ideas?
ANSWER : A. Redness or irritation can be caused by a number of things including yeast infections as you mentioned, but can also be caused by allergies to the environment, or even cold or hot weather. Dogs with short fur can often get sunburns on the skin, and the cold may also irritate or cause redness when outdoors. Allergies to pollens or other outdoor allergens may also cause redness on the body or nose. An allergy medication from your vet is usually all that is needed to clear this up.

If the redness is happening just when outside, it may also be that your dog is digging or nosing around in something that is irritating. It may be a good idea to watch your dog a few times while he is outside to see if there is anything he enjoys exploring. The redness could just be irritation from that.

However, if you are concerned about the redness, it is always a good idea to bring it up with your veterinarian to make sure there is not a more serious cause behind it.

Q. My cat has a major rash on her back it looks like red bumps an some have even turned into scabs.
ANSWER : A. Skin disorders can be particularly vexing to diagnosis and treat. One of the most common causes of skin rashes in cats is allergic dermititis caused by the bites of fleas. Some cats are very sensitive to the bite(s) of fleas and will react with excessive itching, scratching, and scabby bumps particularly on the lower back and nape of neck. Finding fleas on your cat is a pretty good indicator that fleas are causing the skin irritation. Unfortunately, NOT finding fleas doesn’t rule out an allergy to fleas, as it takes only one bite from a flea to cause a reaction in sensitive cats. Moreover, there are many other possible causes for skin rashes in cats, including thyroid disease, fungal diseases, bacterial or viral infections, and irritation from chemicals in the enviroment (scented litter, fabric sheets, air freshners, floor and carpet cleaners, etc.).
A trip to the veterinarian is your first step in treating skin disorders. Your vet will examine your cat, checking for fleas and other external parasites and also looking at the distribution pattern of the rash which will help your vet to determine what might be causing the rash. If necessary, your vet may take hair or skin samples for analysis. Blood work may also be necessary if your vet suspects thyroid diseases or another metabolic disorder.

Q. Why is everything bllod shot on my cat? Tips of ears, lips and gums, and corners of eyes by the eyelid
ANSWER : A. This sounds like a potentially serious blood clotting disorder of your cat if the areas that are blood shot are bright red in appearance. However if the area are just pink and the same color as the rest of the body, it could be that these are just the most visible areas on your cats body.
If however these areas (tips of ears, lips and gums, and corners of eyes) are bright red and blotchy in appearance then I would highly recommend having your vet take a look and potentially testing her blood for a clotting deficiency or an immune mediated disorder.

Read Full Q/A … : Vetinfo

Q. Rash, red, raised, white center,…on her belly and groin areas
ANSWER : A. This sounds as though it could possibly be allergies either due to environment or possibly food. You can try switching her to more of a hypoallergenic formula. If that doesn’t help, next step would be to see the vet who may prescribe Benadryl specific to your dog’s weight.

Q. My dog had very red gums. He is also eating grass. Is this normal?
ANSWER : A. Normal gums on a dog are usually a pinkish color, and can be checked for health by lightly pressing down on the gum until it turns white. When your finger is removed, the color should return within 2-3 seconds. In dogs that are anemic or ill, the gums will continue to be a pale white color for a long period. Gums that are blood red, or appear to be bleeding can indicate a problem such as a bleeding or blood clotting disorder, and can also sometimes indicate ingestion of a poison or toxin causing a bleeding disorder.

If your dog’s gums are actively bleeding or blood red, you think your dog may have ingested something toxic or poisonous, or he has other symptoms of bleeding, lethargy, or illness, it is best to contact your local veterinarian or emergency clinic immediately for treatment.

Q. My dog has no fleas, but is scratching and licking continually. He has been through a round of prednisone and it hasn’t helped. What can I do?
ANSWER : A. Itching can be caused by more than just external parasites, and if your dog is already on a flea medication, then it is possibly not the case. Itching can indicate anything from allergies to even minor skin infections causing problems. If your dog has been treated with prednisone (a steroid that inhibits the immune system) and it did not help, then looking at other options may help.

Food allergies are very common in dogs and can present with itching and licking all over the body rather than on just one spot. Common food allergens include ingredients such as wheat, corn and soy products, however dogs can be allergic to almost anything! Starting a food trial of an allergen-friendly diet from your vet or pet store that avoids these common ingredients may help. The food should be switched over a period of 7-9 days and then given about a month to decide if it is helping.

Small skin infections or yeast in the skin can also cause itching, however this itching is often more specific to a certain area of the body (such as the toes, or base of the tail). Your vet can perform a skin scraping of the area to be cultured at a lab to look for any yeast or bacteria. If they are present, a medication given either orally or placed on the affected area can clear up the infection.

In some cases, licking and chewing can actually be due to a boredom or anxiety behavior. Dogs may lick one spot obsessively to the point of creating sores or wounds in the area. Stopping your dog from licking and chewing either through the use of dog booties, no lick strips, T-shirts or even Elizabethan collars can break the habit and give the area time to heal. Licking and chewing can also cause the spread of bacterial infections so should be deterred even if not behaviorally caused.