I would have thought that, if you've reached adulthood, you'd know if you had headlice. I have a vague memory of having nits when I was 7 and, staying with my aunt in Whitley Bay, much to her chagrin and assurances to my mother that I must have caught them from a Scottish child I'd played with on the beach. I seem to remember they itch. If so, I would not present myself at the hairdressers for a cut and blow until I was sure I was no longer infested.
