Your problem is Contact dermatitis caused by irritation From benzoyle peroxide. Firstly , you should stop using this product , wash your face with water ( not warm) , avoid using any soap , Foam or cleanser. Mild steroid cream such as 0.02% or 0.1% Triamcinolone cream should be applied twice a day For about 7 day to treat the irritation. also moisturiser for sensitive skin should be applied on top of the steroid cream Avoid using anyother cream such as anti - wrinkle or whitening cream also.