After FUE, how soon can I use selenium sulfide (selsun) shampoo?

I use this shampoo daily for seborrheic dermatitis since I was a child and it works brilliantly. I am considering FUE. Shampoo daily, I have no issues. If I don't use this shampoo for a couple of days my mid to lower back neck scalp (around donor area) will get irritated. Waiting more than a couple of days is a concern. Waiting more than a week may be a deal breaker! Rest of head is fine. Just donor area is where I need to use product. And, is condition likely to transfer to recipient area?