Witch hazel for injection site

Hi. MS nurse suggested witch hazel for the injection site. Mine goes red and inflamed 3-4 days after the plegridy injection. I tried E45, I kinda found some relief but it does not last long. If I try witch hazel, when do I apply it on? I worry, I am not sure I should put some on when the site is very inflamed.

I can’t take antihistamine. The pharmacist said it’s not a good idea, as I am trying to conceive, but I may have to check this point with my GP. Thank you.

Anyone, please? I would love some practical advice based on experience.

Thank you.