Here's why:
* Possible Causes: There are many potential causes, ranging from harmless to serious. It could be something simple like a piece of food or a harmless skin irritation, or it could be a symptom of a more serious condition like an infection, parasites, or an allergic reaction.
* Potential Dangers: Waiting can worsen the problem and put your puppy at risk.
* Veterinary Examination: A vet can examine your puppy, determine the cause, and recommend the appropriate treatment.
Please take your puppy to the vet as soon as possible.