DS eye has swollen!

[frostedviolets]

He's 10, asthmatic and not been too well recently (had a bit of a cold, off food)

He's just come downstairs after falling aswell in his bed and one of his eyes is swollen underneath.
He seems fine in himself.

Any thoughts on what could have caused this?
Obviously GP will be in order if it doesn't go down.

Im about to give him some antihistamine.

We have a cat, who sleeps mostly on his pillow.

Allergies run in the family, me, DH, DM, BIL all have hay fever and DB has severe cat, possibly dog too allergy.

I'm a little concerned he may be becoming allergic to the cat..?
Or is that silly?
We've had the cat maybe 4 years?
Do people suddenly develop allergies after 4 years?
It's just the fact that the cat sleeps on the pillow and it's his eye that's swollen up after sleep, I'm just wondering..?

Yes correct.
Never had any form of allergy testing.

He developed severe coughing and near constant throat clearing at night at 9 years old, it then progressed to in the day coughing and throat clearing aswell but primarily at night.

When I took him to see the GP they used a peak flow monitor and diagnosed 'cough variant asthma'.

My DB has always disputed the diagnosis believing it to be an allergy.

He takes a brown preventer and has the blue rescue.

He's been absolutely fine for a long time then a few days ago developed a mild night fever that went away with calpol, went off his food, coughing a lot, generally 'off'.

He seems absolutely fine now except that he is still coughing quite a lot, mostly in bed and after sleeping yesterday he woke up with a swollen eye.

Antihistamine syrup got rid of the swelling, the swelling was on the side of his face that was on the pillow and I remembered last night that I did see the cat on the pillow next to his face when he was sleeping.

Not sure what to think really.

Don't let the cat in the bedrooms.

I’d definitely go back to the Gp and ask for allergy testing. While sometimes DCs just have cough variant asthma for no detectable reason, often it is because of allergies and given your family history and the latest development allergies should be ruled out.