[quote=Zahra]What causes these? What holistic treatments are available?
What is the chance for reoccurrance?[/quote]
Skin growths of this sort (actually any local lesion) are an external manifestation of an internal imbalance, The trigger(s) of this imbalance can be anything from an infection, allergen, toxin, emotional stress, etc.
Homeopathic treatment can often eliminate the imbalance in the young. Regarding the skin growth itself, it could be anything from a lipoma to a cyst or a tumor. Your vet’s exam is the best place to start investigating it.