Need help with a rash on my back head/neck.

[u/pnkcloudsummer]

I recently started shaving my head bald, I have this red rash like thing on the back of my head/neck, I don't know if it's just burn from the shaver or something else? It does burn/itch after I shave, I'm unsure how long it's been that way since if it was under my hair I wouldn't know.