What Are the Causes of a Crusty Raised Scab on a Dog’s Body?

Pet Health


June 6, 2022

Nothing is more alarming to a dog owner than feeling something bizarre on your dog’s skin when petting their fluffy friend.

It might be disheartening to find crusty scabs on your dog’s back, especially if you don’t know what caused them or how to cure them. But the good news is that canine skin disorders are rather common and normally treatable.

What Do Crusty Raised Scabs Look Like?

Crusty scabs can take on a variety of shapes and sizes, but they commonly resemble lumps, blisters, or bumps. These scabs may appear spotty and visible if your dog has short hair. If your dog has long hair, they may only surface when you push back the hair to reveal the skin.

Causes of Crusty Raised Scabs

Crusty scabs on a dog’s skin can appear for a variety of reasons. Allergies, external parasites, fungal infection, bacterial infection, yeast infection, immunological dysfunction, nutritional insufficiency, and hormonal imbalance are the most common causes of a crusty raised scab on dog.


You might be surprised to know that dogs, like humans, can be allergic to virtually anything. Crusty scabs and skin disorders in dogs are frequently caused by allergic dermatitis. There are some common allergies in dogs.

Food Allergies

Some foods can cause allergies in dogs, resulting in itching and scabbing on their skin. Some dogs have no food sensitivities, but others are allergic to wheat, maize, soy, eggs, poultry, beef, and so on. Your veterinarian can assist you in determining which foods are causing problems for your dog so that you can avoid them and your dog can heal.

Pollen Allergies

Dogs love to run free and occasionally run into bushes that contain lots of pollen, which can lead to an allergy. Pollen sensitivity is common in dogs, and it can lead to dermatitis. Itchiness, rashes, blisters, sores, and scabs can be the result of it.

Environmental Allergies

Pollen is a serious issue, but there are several other things within a dog’s environment that can lead to irritation or crusty scabs appearing on the skin. Anything, ranging from fertilizer to an ingredient in the dog’s shampoo, could lead to problems. The best way to figure out what’s bothering your dog is to gradually remove potential allergens from its environment and observe how its skin reacts.


Skin infections or disorders are one of the most common causes of crusty scabs. If you suspect your pet is suffering from an infection, you must take your dog to the veterinarian right away. Many infections are easily treated with antibiotics, but if left untreated, they can lead to more serious problems for your pet.

There are three primary types of infections that you need to be aware of if you own a dog.

Bacterial Infection

These infections happen when a dog is constantly chewing and licking its inflamed skin. As your dog is doing this, its skin begins to break and becomes susceptible to bacteria, causing a secondary infection.

As bacteria enter, acne-like lesions can develop, causing even more irritation, which leads to even more scratching, which leads to even more crusty scabs.

A Fungal Infection

The fungus that causes ringworm also causes skin irritation, hair loss, itching, and scaly skin. The ring-like spots of irritation that ringworm causes on a dog’s skin make it easy for you to identify and treat the issue.

Yeast Infection

Yeast infections are one of the most prevalent skin ailments that a dog will encounter throughout its life. Yeast thrives in warm, moist environments in the body. When there is an eruption, the skin might become irritated and uncomfortable. Dogs scratch and chew excessively to soothe the irritation, resulting in crusty scabs.

In dogs, yeast infections are pretty easy to detect. Aside from the scabs, the affected area is often pigmented and darker than the surrounding skin.

Nutrient Deficiencies

A dog’s diet can have a significant impact on its skin and overall health. Skin problems can arise when there are vitamin and mineral deficits.

If your dog has crusty scabs on its back but no other symptoms, it’s possible that its diet isn’t meeting its nutritional requirements.

Immune Disorder

Immune problems can make a dog’s skin unable to resist infection and bacteria, resulting in crusty scabs. Another explanation for crusty scabs is that a dog’s immune system is trying to combat itself since it is on high alert and working overtime due to immunological diseases.

Hormonal Imbalance

Hormonal changes can disrupt the balance of oils in your dog’s skin, causing discomfort and dry patches.

Treatment to Get Rid of Crusty Scab

The treatment approach will be decided when a veterinarian determines the exact cause of the crusty scabs.

  • If the skin irritation is caused by a change in diet, then another change in its diet is required.
  • If a dog’s skin lesions and redness are caused by the external environment, including cleaning products and parasites, then the owner should reconsider the situation. A sensitive dog’s skin can benefit immensely from switching to non-scented laundry detergent and shampoos.
  • Medications can be used to treat both bacterial and fungal illnesses.
  • If skin irritation is caused by an immunological issue, hormone imbalance, or other health problem, that problem must be addressed first.

Caution and Factors to Consider

There’s a reason why your dog’s skin has scabbed. It’s critical to understand what’s going on with your dog’s skin so you can treat the underlying issue rather than just the scabs.

As the scabs heal, they will become itchy. Keep the skin moist to prevent your dog from scratching these areas. You can use a mild soap or a gentle dog shampoo to clean the area, but make sure to rinse it well. If your dog develops scabs regularly for no apparent reason, consult your veterinarian.

Begin giving your dog an omega fatty acid supplement daily. Omega fatty acids have been shown to improve skin and coat health in dogs, particularly those that suffer from allergies. Give your dog a teaspoon of coconut oil mixed with its food once a day to keep its skin supple from the inside out. Keep an eye out for swelling and infection surrounding the scab, which may necessitate the aid of your veterinarian.

Crusty scabs should not be wiped away. Allow them to soften with water or coconut oil and flake off naturally.

Final Words

Crusty scabs on your dog’s back might be caused by a variety of factors, but they are all treated in one way or another. Treatment can usually be done at home without the assistance of a veterinarian. But, in most cases, a veterinarian should be consulted right away.