Having some discoloration on the back of the scalp. Could it be folliculitis?

Hi doctor,

I shave my head with a razor blade once in a few days as if shaving my face. I have been doing this for seven years now. Four years ago, my doctor noticed that I had a discoloration on the back of my scalp. He said it was nothing to worry about and had probably always been there like a birthmark. Now, a few years later, it has never actually gone away. It has become bigger, more pronounced, and red all the time. It does not itch ever, but it does stay red and feels rougher than normal skin to touch. It just looks like a bright red rash that never goes away. It does not turn scaly or white and also does not flake off to my knowledge. I do not have a lot of anxiety over it, but it is extremely embarrassing to the point where I do not show my full head a lot in public. Could it be folliculitis? Could that last for years? Please help.

Hi doctor,

Thank you for the reply.

NICH and other types of birthmarks are not something that I had come across yet. I do have one final question. Would it be possible for this to also be tinea versicolor? It looks very similar to pictures of it and I have had some issues like seborrheic dermatitis on the face before and other oily-type rashes.