Does hydrocortisone cream 1% affect transplanted hairs?

Hydrocortisone cream will not affect the transplanted hair as long as you use it as directed.

I don't think it will affect you this far out from FUE transplant, but I would try to find a HCT cream with minimal chemicals/preservatives so as not to bath the new follicles in toxins.  I would also only use for a short period of time as you did.  Best of luck,  Dr. Giordano

A mild hydrocortisone cream used for a limited amount of time is an acceptable treatment for scalp redness. Used in this way, it should not have any negative effects on the growth of your hair, and there is no existing proof that it does.

For only 12 days of use and so far past your transplant date, I doubt it would have any effects upon your transplanted hair. If your doctor and pharmacist both told you it would be fine I'm not sure what I could say that would be move convincing.

Does hydrocortisone cream 1% affect transplanted hairs? The answer to this questions is that at 2 months topical hydrocortisone will not affect hairs if used for 12 days.

I would agree with your doctor and the pharmacist. Hydrocortisone cream is a good remedy to assist with redness post hair transplant. 

If you have persistent redness, go back and ask your doctor what to do. Many doctors use steroids at this point in time when redness persists