25 year female with red color papules and itching on her body

HI every one A 25 yr female patient got red color papules on the abdomen ,thighs,hands and legs.itching present,persists for 2 days and slowly deminishes with pigmentaton,followed by occurence of new rash.Her blood reports ESR and platelet count is normal What might be the diagnosis for this condition,and treatment options? Regards Dr.swetha