My mother, 70, was diagnosed with Herpes Zoster around 4 weeks ago and is now cured with no scars left by prescribing medicines as advised by a dermatologist. She is now continuing Calosoft plus ointment only. But since four days, the area of the infection (around right hand arm pit) is itching when the ointment dries away after two hours. The skin also appears slightly darkened. The itching is more during night. Please advice remedy treatment.