A 50-year-old man complains of a rash on the skin of the torso without subjective sensations, sick for 3 months, not treated, the rash progresses. Objectively set: on the skin trunk disseminated rash in the form of red non-inflammatory lenticular and numular papules with clear borders, covered with silvery scales, which are easyare removed when scraping with a glass slide, more intensive scraping leads to spotting. What is the probable diagnosis?