I had a hair transplant on the 4th May 2018 and Ramadan is begining tomorrow. Am I able to fast during this time? (Photo)

It is best to ask your surgeon about post operative care as each doctor has their unique regimen.  

There should be no reason why you cannot fast during the day,2 weeks following a procedure.Only severe,prolonged fasting with protein malnutrition will impact hair growth and graft survival.

Yes, certainly you are able to  fast during Ramadan . it would not effect badly on grafts.Most of my patients takes their medication  after evening meal (iftar) during Ramadan and sahur. 

Fasting in a healthy man who had a hair transplant is not a problem provided that it is not for a very prolonged period.

You should be healed by now and you can fast without worrying about healing or your hair transplant.