Hi Loire and welcome to HW and the RA forum
I take Humira and I know that any bite/sore I get will get worse before it gets better. I believe it is due to our weakened immune system and also the disease itself.
When I have a bite/sore I will treat it with an antiseptic cream and wrap it each day and then I am always left with a red scar when it finally heals - ugh!
Jo