There are several possibilities: 1, psoriasis, mainly due to genetics, trauma, smoking, pharyngitis or tonsillitis, etc. In addition to a red rash, there can also be silvery white scales on the basis of the erythema, picking away the scales, you can see the special performance of psoriasis such as punctate bleeding. In treatment, you can take oral amineptin tablets and apply topical carboplatin application for treatment; 2, seborrheic dermatitis, which is more likely, can be seen on the basis of erythema, fine scales, scales usually scraped away after the phenomenon of punctate bleeding is not seen, you can apply trimethoprim ointment for treatment.