Nasal dermatoses can be described as skin diseases that develop around the nose area. The nasal planum is often another name given to the nose. Depending on the cause, such conditions can be often referred to as nasal solar dermatitis or Collie nose.
The numerous diseases that may lead to these conditions in dogs tend to affect the nose itself, the bridge of the nose (the muzzle), or both. The hairy sections of the nose are usually susceptible to pyoderma, demodicosis, and dermatophytosis.
Cases of pemphigus or systemic lupus erythematosus involve crusting, discharge of serum, and ulcerations of the entire muzzle. There is substantial reddening and loss of colour of the nose whenever conditions such as systemic and discoid lupus, and in some instances skin lymphoma and pemphigus, occur. This ultimately results in development of ulcers in the area around the nose.
Nasal dermatosis that is caused by solar radiation is an uncommon condition that may actually be a wrong diagnosis of one of the variants of lupus. The initial areas that are affected by actual nasal solar dermatitis usually tend to be the non-pigmented parts around the nostrils. Sometimes the bridge of the nose may develop ulcers or become inflamed. Summer months bring about worse changes; however pemphigus and lupus can also be influenced by variations in season. Some of the mentioned diseases can affect the regions around the eyes. The abrupt development of redness, fluid discharge, and nasal swelling is considered to be due to an insect bite or sting. Leishmaniasis, the parasitic disease, may lead to ulceration and loss of colour of the nose.
Treating nasal dermatosis requires taking the actual cause into account. Your veterinarian will perform diagnostic tests that will involve taking scrapings of the skin, fungal and bacterial cultures, and biopsies. The results obtained from the diagnostic tests will determine the kind of treatment prescribed.
In case nasal solar dermatitis is diagnosed, the inflammation may be controlled using a topical steroid lotion. Contact with sunlight should be extremely limited. Topical sunscreens could be useful but have to be administered two times every day. It is important to be conscious of the fact that not every sunscreen lotion used by humans can effectively used on dogs. Your veterinarian can prescribe sunscreen medication that can be safely used by your dog.