Possible reactions
Possible reactions include redness, itching, burning, swelling and rash.
It may not be the collagen
The reaction may not necessarily be caused by collagen itself. Fragrance, preservatives or other ingredients can sometimes be responsible.
How to introduce something new
If you have sensitive or allergy-prone skin, check the ingredients carefully and consider testing a new product first.
Remove the mask immediately if it causes significant discomfort.
Skincare should feel nurturing, never painful.