Patients who develop erythema on their body have to be treated on a case-by-case basis to determine the course of treatment. First of all, if the patient has erythema, followed by localized blisters, it is important to consider the occurrence of herpes, such as herpes simplex or herpes zoster. These cases are treated with acyclovir, valacyclovir, and famciclovir, which are antiviral drugs. In other cases, there are erythematous spots with distinct papules or pimples, accompanied by intense itching. In this case, it is necessary to consider the occurrence of skin allergies, such as eczema, these cases can be treated with glucocorticoid ointment and glycerine lotion, as well as antihistamines. However, there are also patients with erythema accompanied by scaling, which may be caused by psoriasis. However, psoriasis is treated with glucocorticoids, calcium-modulated phosphatase inhibitors, and vitamin D3 derivatives. Therefore, if the patient is not sure what the disease is, he should go to the dermatology department of a regular hospital before treatment.