Skincare knowledge / DOCTOR LI
Trying a new skincare product on a small area first
Observe your response on a small area before expanding use. This can help identify intolerance, but does not guarantee that discomfort will never occur.
Read the product directions first
Check the product name, application area, amount, frequency and precautions. Avoid introducing several new products at once, increasing the amount or extending contact time yourself.
If you have a known allergy history, active dermatitis or clearly damaged skin, consult a doctor first. Trying a product yourself cannot replace diagnosis.
Use normal directions on a small area
The American Academy of Dermatology recommends testing a new skincare product on a small area such as the inner arm or elbow bend, using the normal amount according to its directions and observing for seven to ten days. Rinse-off products should be rinsed as instructed, not used as leave-on products.
Watch for redness, itching, swelling or persistent stinging. If discomfort occurs, wash off the product and stop using it. Consult a dermatologist if the reaction is significant or persists.
Keep observing after the initial trial
No reaction on a small area does not guarantee that full-face or long-term use will be free of irritation or allergy. Continue observing after expanding use and adjust to your tolerance.
This article describes an everyday consumer trial method. Clinical patch testing for contact allergy follows a specific medical procedure; the two cannot replace each other.
References
General advice for trying new products; it cannot guarantee suitability for everyone.
This article provides general knowledge. Adapt care to your skin condition and consult a doctor for persistent or significant discomfort. Compiled: October 2026.