Histiocytomas can affect dogs of any age. They can appear on any location on the body, however, the vast majority of histiocytomas appear on the head. Histiocytomas usually occur on dogs under three years of age; histiocytomas are one of the most common tumors in this age group. The breed or sex of the dog does not appear to influence their development.

These tumors appear rapidly and are small, round, and hairless. They will often ulcerate and then become smaller and go away. They usually appear as a solitary mass, but more than one may be present at a time. These tumors are benign and are not considered to be a health risk.

Treatment often involves just letting the tumor run its course. Histiocytomas can be surgically removed if they are bothering the dog and are in a location where the removal will allow for closure of the skin. They can also be treated with topical steroids and antibiotics if they ulcerate, become inflamed or infected. However, most dogs never receive nor require any treatment intervention. If you see a small tumor that develops on your dog make sure to have it examined by your veterinarian.

References

Ettinger, S; Feldman, E. Veterinary Internal Medicine 5th Edition. Published by Saunders. Philadelphia; 2000.

Bonagura, J; Kirk, R. Current Veterinary therapy 12. Published by Saunders. Philadelphia; 1995.

via