Meibomian gland adenoma?

This past week Murphy (4 year old Irish Setter) developed what I thought was a small stye on his lower eyelid (beneath the area that touches his eye). It was not bothering him and was the same color as his fur (perhaps a little lighter). Over the past day the stye has grown a bit and is now a pinkish/red tone. It still does not appear to be bothering him although he is tearing more from that eye than the other. There appears to be a tiny black bump on the rim of his eye right above where the lower bump is. I was wondering if this might be a blocked tear duct. I can send you pictures immediately as well if that would help you. I can take him to my vet first thing on Monday but am anxious that he could develop cherry eye if this isn't seen to immediately. Any advice you could offer would be greatly appreciated.

Best wishes,
Samantha

Thank you for your quick response. I am sending the photos in their original large size (if they are too large for your operating system please let me know and I will re-size them).

Please note on image 6230 (1st photo) that the small black raised area on his lower lid is evident (looks like a skin tag and has not changed size)

The area that is enlarged is beneath and not touching his actual eye (looking at the photos from the angle I took them it looks as though perhaps it is touching his eye, but the bump is a few millimeters beneath his lower eyelid). I have done a few warm compresses to the bump at the direction of a local emergency vet I spoke with on the phon) these did not seem to bother Murphy and have not changed the size of the bump.

I forgot to mention previously that Murphy has atypical Addison's disease and takes 1/4tsp of Tylan powder on his food each night as well as a .5mg pill of Dexamethasone each day for a gluten allergy and his atypical Addison's.
Since being diagnosed by a previous owner's Vet (he is a rescue) he has had normal blood tests and regular/normal stool for the past 2.5 years since I have owned him. He's a big boy and weighs 79lbs. The atypical Addisons's doesn't appear to contribute (presently) any issues to his overall health.

Thanks so much for looking at these. I look forward to hearing your thoughts.

Dear Dr. Marie,

Thank you so much for your thoughtful reply. You have put my mind at ease until Murphy can see his regular vet on Monday. I was more concerned that it could have been a form of conjunctivitis or that his third eye lid could have an infection that would lead to cherry eye and the need for surgery than anything else.

Now that I know he is not in any immediate danger we will enjoy our jaunt to the park much more this afternoon.

Best wishes,
Samantha