I have long hair (not sure if it's relevant).
Lately I have been getting what feels like pimples, but without a head, all around my hairline.
They start from behind my ear lobe, and follow the hairline all the way around the back to behind my other ear lobe.
I haven't changed my shampoo or anything, and my hairdresser hasn't said anything about them.
Could this just be from heat or maybe something else? It seems to have started a few months ago, and I've had long hair forever.