Lash and Brow Services
Lash and Brow Services
This domain tests lash and brow anatomy, patch testing, extension and tinting technique, adhesive control and contraindications.
Anatomy and cycle
The upper lid has roughly 90–150 lashes and the lower 70–80. Each lash cycles through anagen (about 30–45 days), catagen and telogen, with a full cycle of around 4–11 weeks - which is why natural lash shedding is normal and infills are needed every 2–3 weeks.
Lash extensions
- Isolation - one natural lash per extension (classic) so the lash can shed naturally.
- Specification - diameter 0.05–0.25 mm, length 6–15 mm, curls J, B, C, D and variants.
- Adhesive - cyanoacrylate; cure depends on temperature and humidity (commonly around 20–24 °C and 45–55% relative humidity). Keep adhesive 1–2 mm from the eyelid.
- Patch test - 24–48 hours before, recorded.
Tinting and brows
Tints typically contain PPD or similar dyes and require a patch test 48 hours ahead. Keep product off the skin and remove with the correct remover. Brow lamination uses a lifting cream (often thioglycolate) followed by a neutraliser, with skin and hair condition checked first.
Contraindications
Eye infections, styes, conjunctivitis, recent eye surgery, blepharitis, known adhesive or dye allergy, and uncontrolled trichotillomania.
Worked example
A client reports swelling after a hair dye containing PPD. You do not proceed with a brow tint, even a "natural" alternative, without medical advice and a documented patch test. You explain the cross-reactivity risk and offer shaping only.
Traps that cost marks
Patch testing on the day; using too much adhesive; failing to isolate lashes; leaving tint on too long; ignoring a previous reaction because "it was fine last time".