Hello there. We call these "old man warts". So I am curious if maybe your dog is a bit older than 4.5 years old. Regardless, these growths usually occur in these breed-types of dogs and are NOT a cancerous process. However, sometimes they can be irritating to the dog themselves and they may scratch or bite at them. If this is the case, they can bleed and/or become infected and should be surgically removed by your veterinarian simply because they are irritating to Patch. If they are not bothering Patch at this time, I would recommend to continue to monitor them and let your veterinarian know about them the next time Patch is in for a visit.