Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
If Pip is otherwise healthy, this swelling is probably due to an allergic reaction. This could be from an insect bite or a contact allergy from the yard. The treatment for this is Benadryl at 1 mg per pound every 12 hrs. It will also help if you apply a topical benadryl to this area. Of course , if Pip dpes not respond within a day, have your vet examine Pip because this could also be an infection that will require veterinary treatment.
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Thank you so much, Nicola, for your kind rating. It is very much appreciated! Even though you have rated, we can still communicate. If you have other questions, please Reply. I am always happy to help. I hope Pip feels better soon!
Have a wonderful day!