At this age, a skin mass that looks like this could be consistent with histiocytoma or basal cell tumor, both benign (not cancerous) skin tumors. However, the physical characteristics this mass may also be consistent with a malignant (cancerous) type of skin mass called a mast cell tumor. For any growths at any age, a veterinary visit is always recommended. If you still seek further information, please visit our
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Basal cell tumor
Mast cell tumor