My dog has a rash and lump in her groin. Is it heat rash or vet visit?

Hi and thanks for using PetCoach! Sorry to hear about Ruby. This looks like bacterial dermatitis, also known as a staph infection. This condition is caused by a bacteria known as Staphylococcus pseudointermedius. It is a normal bacterial resident on the skin of dogs and very commonly causes problems like this in dogs. It can present as a red rash or with red bumps (papules) and if they contain pus they are called pustules. Sometimes the cause is unknown and other times it's caused by external parasites (fleas, ticks, mites, etc), allergies to inhaled allergens/flea bite allergies/or food allergies, contact irritants or allergens, internal organ problems, intestinal parasite problems, nutritional problems, a primary bacterial skin problem, and the list goes on. Most of the time it is hard to narrow down the causative problem. If it presents as a seasonal problem (spring-fall) when it first starts, this is indicative of inhaled allergies called atopy. Typically, each spring it starts and can persist into the fall depending on what the dog is allergic to. It can worsen if the dog gets allergic to more allergens and can become a year-round problem.

This is NOT Contagious between dogs or people. this area is small enough that you could probably monitor it unless Ruby is licking it and it's bothering her. If you do decide to take her (or it worsens, or other signs develop) your vet can take a detailed history and do a complete exam with diagnostics to follow if indicated. Sometimes these infections are stubborn and require oral antibiotics and medicines for itching because this condition can become rather itchy and irritating for the pet. Antihistamines or even steroids are used to calm the itch depending upon the level of itching and the suspected cause. Fish oil is also good for the skin and all organs of the body as they are anti-inflammatory. Many other strategies can be employed such as antibacterial shampoos.

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