Facial rash

It’s been awhile since I’ve been here.
I woukd appreciate any insight anyone may have with facial rashes. For awhile now, my husband has experienced a facial rash. GP thinks it might be the mercaptopurine. He also receives 6 weekly Infliximab which is now causing red eyes for about a week after the infusion
GP recommends ceasing mercaptopurine – dh clearly not keen on that suggestion.
The rash responds to steroid cream or anti biotics but quickly returns upon cessation of…