Experienced and professional animal trainer provide their insights in answering this question :
A. Could be an infection on the genitals, check with your vet that doesn’t need treatment. Also could be a urine infection.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

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.
Environmental or food allergies can both cause itching in the genital area. When food allergy is the culprit the itching occurs all year long while environmental allergies may be seasonal depending on what plants or trees are pollinating, unless the inciting allergen is indoors.
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.
Redness and swelling are the first signs of a yeast infection, but a dog`s symptoms can progress to swelling, warmth, and pain in the infected area. Odor. Another common sign of yeast infection is a distinct smell, which will likely be your first indicator that your dog has this condition.
In severe cases, especially with vulvar, lip or tail fold dermatitis, surgery may be suggested to remove excess skin. Hydrocortisone cream, chlorhexidine gluconate wash, and ketoconazole shampoo may be used. Antibacterial ointment, wipes, and shampoos are sometimes prescribed.
Excessive licking can be a sign of infection, injuries, or other problems with your dog`s urinary or reproductive tract. Call your veterinarian if you have any concerns.
Flea allergy dermatitis, seasonal allergies or atopy, food allergies, contact dermatitis (e.g., soaps and perfumes), and sarcoptic mange (mites) are some of the most common causes of pruritus in dogs. “Pruritus due to skin disease is one of the most common reasons dog owners seek veterinary care.”
A daily vinegar and water wipe down might be necessary for the dog who has chronic yeast infections. If her skin is dry and irritated from excessive licking, 100% coconut oil from your kitchen can help soothe her skin. It is okay if she licks the coconut oil off, but you just may need to reapply.
Vaginitis is inflammation of the vagina that may cause redness, swelling, and discharge. In puppies, it is usually a harmless condition that resolves on its own after its estrus (heat cycle), but older dogs usually need treatment.
Although a yeast infection of the skin may start in a very specific area, if left untreated, it can spread and affect the entire body, including the dog`s face and mouth. Often, there may be a secondary bacterial infection accompanying the yeast infection.
An Excellent Probiotic For Their Gut

If that was not enough, the probiotics found in yogurts can help your dog to fight yeast infections, which can result in ear and skin problems. Furthermore, probiotics may help your dog`s body to absorb nutrients and boost immunity.

Yeast infections can cause red, irritated, or itchy skin or ears, and there is often a sweet or musty odor. Chronic yeast infections can cause the skin to become thickened and discolored (gray, brown, or black).
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.
If your dog is focusing the licking on their rectum or groin, they may be experiencing anal sac, urinary tract, or reproductive organ infections. Your vet may first express your pet`s anal glands to rule out infection and impaction.
With vulvar eczema, your vulva may appear swollen, red or darker than the surrounding skin — similar to vulvar inflammation. You may also have bumpy skin or scaly white patches of skin that are irritated.
Distract them – Try giving them something else to do that stops them licking, such as a chew toy or a food puzzle. Training – Try training them to sit, or teach them to do something that redirects their licking and is rewarded by your affection and attention, such as giving you their paw or rolling over.
Most of the time red and itchy skin in dogs is caused by allergies. However, external parasites like fleas and mites can also cause excessive scratching in dogs, and skin infections or dermatitis can occasionally be the cause as well.
Most dogs will inevitably encounter excessive itchiness at some point in their lives. In many cases, it will be annoying for your dog but not serious. That being said, some skin conditions will need to be seen by a veterinarian and will require treatment in order to prevent them from growing in severity.
Pruritus in dogs is the sensation in the skin that causes them to scratch. It is a symptom caused by dry skin, allergies, parasites, or other underlying conditions. Anxiety and boredom can cause dogs to lick, chew, and bite as a response. Changing your dog`s diet may be the key to stopping obsessive licking behavior.
My dog is always scratching, but they don`t have fleas

Insect stings/bites, food allergies, inhalant allergies, contact allergies and other skin conditions can also cause itching. Check the area closely for swelling, redness, dandruff or anything else that could be unusual.

Irritation to the skin around the vulva, or vulvar fold dermatitis, is caused when there excessive skin or folds of skin around the peri-vulvar area. This can be due to obesity, breed conformation, or due to early neutering (juvenile vulva).
Apple Cider Vinegar Water Spray

If your pet has itchy skin, this concoction of 50/50 water and ACV spray can help relieve your pet`s skin allergies or irritation. This home remedy can also be used in a bath format. Fill up a small container with equal parts water and apple cider vinegar and soak your pet`s paws in it.

Whether she is in heat or not, if she needs a quick wipe, a wet washcloth or wet wipe for dogs will work wonders. She will lick her privates clean when she knows they need to be cleaned, but if you`d like to wipe her after going potty, a wet wipe is an easy and efficient way to keep her clean from front to back.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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.

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. WHAT ARE SCALY PATCHES ON THEIR BACKS NEAR THE TAIL, I HAVE SEEN THIS FOR THE SECOND TIME ON A CAT AND NEVER GET AN ANSWER FROM THE COUPLE VETS I HAVE
ANSWER : A. Scaly patches of skin near the tail may be an indication of possible external parasites (such as fleas) cats may scratch or chew at this area in an attempt to relieve itching which could lead to scaly or irritated skin. Treating for external parasites can help. Skin infections may also cause a similar appearance especially if your cat has chewed or scratched at the area excessively. Preventing licking and chewing of the area if excessive with the use of a T-shirt or Elizabethan collar can help, as well as a vet checkup as needed.

Dry skin from too often of bathing or even changes in temperature (such as exposure to dry, cold air) may also happen. A soothing pet wipe or shampoo that includes aloe or oatmeal may help to soothe irritated skin and decrease flaking and dryness.

Q. My cat just developed extreme irritability on his butt and sides. He’s a 6 year old Maine Coon. It seems like he is in pain. No parasites or fleas.
ANSWER : A. It is possible that a sore or skin problem has started on him that is causing your cat some stress. If the irritation is situated around his back end and anus, constipation or diarrhea can sometimes cause irritation. The anal glands are also located in that area and can become full and irritated.

if he is experiencing changes to the skin or hair on his back and sides, it is possible that an underlying infection such as skin or fungus, or even a metabolic condition are causing the change. Preventing him from licking or chewing at the area can help prevent secondary infections from forming. If the irritation continues or worsens, then scheduling a vet visit can help determine the cause.

Q. My dog is in misery with anal itching. Glands expressed, eats well, no diarrhea no vomiting, weight loss or hair loss. Great disposition. Help.
ANSWER : A. Anal itching can sometimes be a response to a food allergen. Common food allergens can include grains such as wheat, corn or soy, or even to some proteins such as beef or chicken. Changing to a more allergen-friendly diet may help reduce the anal itching and provide some relief. External environmental allergens may also cause anal itching, though symptoms are usually more generalized all over the body, rather than just in one area. However, if your dog is scooting on a surface he may be allergic to, then you may be seeing more irritation in that area. An allergy medication may help to relieve the symptoms.

Q. My 11 year old Chi has these ridges across his nose that are hard and dry sort of look like a wart, should I worry?
ANSWER : A. Dry patches or calluses on the nose are very common in pets and can occur if they enjoy digging outdoors or sometimes just digging around the house. They can appear as areas of minor hair loss where the nose meets the fur, and can also have a hardened, patchy appearance. These are normal and can sometimes come and go on their own.

However, if the patch appears to be spreading, or is bothersome, that is not typical of a callus. If the area is itchy, red or appears to have an open sore or wound, it may indicate an issue with the skin or a growth that is abnormal. Keeping the area clean and dry with a washcloth may help with minor irritation, while more serious or prolonged irritation should be looked at by your vet.

Q. Excessive itching irritated around genital area.
ANSWER : A. Could be an infection on the genitals, check with your vet that doesn’t need treatment. Also could be a urine infection.

Q. My dog keeps licking himself in different areas, what does this mean?
ANSWER : A. Licking and fretting is part of a normal dog’s grooming behavior. It only becomes a problem when your pet does it in excess or carries it to the extreme.

In most of cases excessive nibbling is related to skin diseases. Problems like skin allergy, parasites, infections, anal glands problems usually results in excessive itchiness.

In rare cases skin irritation can be a result of internal disease like liver problems or even a tumor.

Excessive licking and chewing should be promptly treated as dog dogs will self-inflict skin scratches and wounds which could be easily avoided if treatment is not delayed.

Read Full Q/A … : Excessive Dog Licking