i swear im allergic to my boyfriends room/house

hello, i need some help pls.

so i live in scotland and my bf lives in london, i often come down to visit and stay with him.

almost every time i've come down to visit and stayed in my bfs room i get EXTREMELY itchy eyes. other than a blocked nose RARELY thats pretty much the only symptom i get. of course at this time of year it could simply be hayfever but i've also had this everytime i visit even during winter.

my boyfriend DEEP cleans his room because of this everytime i come to visit and yet the itchy eyes still persist, at one point the last time i visited (around dec/jan) a mole developed under my eye and then went away within a day? but he changes his sheets, pillows, everything, so there is hardly any dust that would cause this.

i'm not sure it's hayfever because i've been out all day and my eyes have been fine but the minute i get back to my bfs home my eyes get all itchy and red, and it is NEVER this bad when i'm at home in scotland.

help pls ;-; its startin to feel like im just allergic to my bfs room