Abstract
Lyells syndrome, or toxic epidermal necrolysis, is a skin disorder characterized by extensive exfoliation of the epidermis. The prognosis for this disease is poor due to damage to the visceral organs, electrolyte disturbances and the risk of infection. The article describes a clinical case of Lyells syndrome in an HIV-infected patient who was first prescribed ART in combination with valganciclovir. The diagnosis was made on the basis of characteristic clinical manifestations and the exclusion of another similar pathology. On the background of the therapy, the rash regressed, the areas of damaged skin became epithelialized, and the body temperature returned to normal. A differential diagnosis was made with measles, Stevens-Johnson syndrome, staphylococcal infection. Against the background of the therapy, the patients condition was positive.