Patch test
Also called: Allergy test and Skin test
Applying a small amount of a product to a patch of skin a day or two before a treatment to see whether it causes redness, itching or swelling.
A patch test is the simplest way to catch an allergy before it happens on your face. A dab of the product, whether a lash or brow tint, a lash lift lotion, an extension adhesive, a hair colour or an unfamiliar henna, is put on a discreet area of skin such as behind the ear or the inner elbow, left uncovered, and watched for a day or two. Any redness, itching, burning or swelling means the product should not be used.
It is standard practice before a first tint or lift, and before hair colour, and it is repeated when the product changes or after a long gap, since sensitivities can develop over time.
A patch test reduces risk; it does not remove it, and a reaction can still occur on the day. This is general information, not medical advice: if you have a history of allergies, eczema or reactions to dyes, ask your doctor before booking a treatment that uses them. Ask when you book whether a patch test can be arranged for a first appointment.
