Some people are allergic to some products. Always perform an allergy test 24 hours prior to applying a depilatory cream. To give this test, apply a small amount of depilatory cream behind the ear. Leave it on for 15 minutes and then remove. If there is no positive reaction (redness or swelling) after 24 hours, proceed with the treatment.
Allergy test / Patch test
People who have a severe physical reaction to a particular substance that has no effect whatsoever on most other people are said to have an allergy. Cosmetic dermatitis is the term used by dermatologists to describe allergic reaction caused by the application of cosmetics. Some chemicals will harm the skin of some people whereas it will not harm the other's skin.
Patch test or Allergy test should be performed behind the ears or inside the elbow. Take a small quantity of depilatory cream and perform an allergy test 24 hours before using it
because sometimes it can take 24 hours to react. After performing an allergy test if you find any redness, swelling or itching then do not apply the depilatory cream.