It's more a random thought, but I had my transplant in February towards the end of summer, which from month 2.5 or so, it was all very cold winter weather in excessively dry rural Australia. My scalp remained red/pink for 9 months, and the moment it stopped being so cold and dry, it immediately returns to a relatively normal skin colour.
I had seen a dermatologist and a hair tranplant surgeon who both didn't see anything 'wrong' with the redness, so could it be a possible physiological condition related to the weather?
I'd also add that I rely on T gel and occasional nizoral to fix scalp flaking in winter while I just about never shampoo in summer, normally