A standardised therapeutic approach to coexistent psoriasis and bullous pemphigoid is lacking, although psoriasis is associated with an increased risk of developing bullous pemphigoid. Here, we report an elderly psoriatic patient who developed a refractory bullous pemphigoid and experienced clearance of both diseases following treatment with dymethylfumarate. Due to lymphopenia, this treatment was stopped and the patient was administered risankizumab without relapses. Dymethylfumarate may be able to inhibit the recruitment of neutrophils and monocytes into the skin. Therefore, thanks to pleiotropic effects, dymethylfumarate could be an effective treatment in psoriatic patients who develop bullous pemphigoid.