A 45-year-old female who is on
disease modifying agents for rheumatoid arthritis presents with a blistering
rash, which is sore but not itchy. On the skin there are multiple superficial
bullae, which rupture easily, leaving erosions, which are painful. The base of
the erosion is red and bleeds easily. The epidermis at the edge of the blister
is easily dislodged by sliding pressure.
In the mouth the blisters rupture easily leaving superficial erosions.
The disease-modifying agent that
the patient has been treated with is likely to be: