During appointment with the doctor a man complains of painful itching rashes that appeared on his skin under the beard and moustache one year ago, with frequent exacerbations occurring throughout the year. Objectively the skin of the facial hair growth areas is bluish-purple, thickened, with pustules, erosions, and scabs covering its moist surface. The fistulous tracts are surrounded by the area of loose pink-red granulation and discharge pus. The skin resembles mulberry in appearance. Make the diagnosis: