A bride with a breakout, an eye infection, a reaction or a burn days before her wedding is a catastrophe you must never cause. Safety, hygiene and contraindications are not three separate academic topics, they are one professional decision made before you touch anyone.

Three levels of cleanliness, and what each really means

• Cleaning physically removes product, oil and contamination. Nothing is disinfected while still dirty, cleaning always comes first.
• Disinfecting reduces most bacteria and viruses by an approved process, chosen for the item and its material.
• Sterilising destroys all microorganisms; rare in makeup, relevant to anything that could pierce skin.

Cross-contamination, the cardinal sin

• Decant, never double-dip. Work from a clean palette with a spatula. This helps prevent contamination of the source product.
• Disposables for anything wet or shared-risk (mascara and lip wands, sponges), one per client, then binned. No fingers in product.
• Sharpen pencils before and after use. Never work on active infection (conjunctivitis, cold sores, weeping breakouts, styes), reschedule.

Physical & personal safety

• Hand hygiene timing: before set-up, before touching the client, between clients, after any body-fluid contact, visibly, in front of her.
• Cover your own non-intact skin; respond to any blood or body-fluid exposure with correct clean-up and disposal.
• Electrical & heat tools: check cords; manage trip hazards; rest hot tools on a heat-proof stand; know your burn response (cool running water, no product).
• Client comfort: drape appropriately; mind ventilation and aerosol awareness in a closed room.

Contraindications, makeup & skin

Recent strong exfoliation (acids or retinol) leaving skin reactive; active infection or inflammation; known allergies; eye conditions. Common triggers to ask about: lash adhesives (cyanoacrylate and latex, common serious reactors), fragrance and essential oils, latex, preservatives and actives.

Contraindications, hair & scalp

Observe and respond to: suspected head lice or nits; suspected contagious fungal scalp conditions; open wounds; weeping lesions; significant scalp inflammation; extreme or unexplained fragility; recent chemical services affecting heat tolerance; scalp tenderness or reported burns; extension attachment points and method; significant traction or medically related hair loss requiring gentle handling.

Patch testing, done correctly

• Follow the product or manufacturer's instructions for site, amount and timing, there is no single universal method. This matters most for lash adhesive, where testing is expected.
• Test ahead of time (commonly 24 to 48 hours), never on the wedding morning.
• Record the product and result in the client's notes. Any itch, redness or swelling means do not use.