If I understood your question correctly, you have a fungal-like infection on your chin area and you were prescribed Cetirizine, Itraconazole and vitamin supplements. I found no reported hair greying reactions linked with the use of these drugs. So, you can be assured that these medicines are safe in that matter.
Since you have asked this question, did you see your hair turning grey? Do you suspect these medicines?
If you do then send me an e-mail or ask another question in this section with the details of your symptoms, date of initiating these medicines, date of when you noticed your hair turn grey, and other related things like if you dye your hair and if you are on any hormonal medicines.