[Greycloud]

Iwas going to say allergies possible, but you state he is not itchiing. Of course just because it isn't itching doesn't meen it still could not be a reaction to an allergy, esp. at this time of year. However, it does sound like a cherry eye. What type of puppy is he? This is very common in cockers, shih tzus, droopy eyed dog breeds and short muzzle breeds such as pugs. My cocker mix had developed it and we had it removed. Now that was many yrs ago and cost about $350. It can become rather uncomfortable. Sometimes one it appears in one eye it then comes up in the other. Let us know how it goes at the vets.