Astaxanthin is a natural pigment with antioxidant and anti-inflammatory properties. Astaxanthin added to the mask can help restore skin's radiance, brighten skin tone, and provide some moisturizing effect. However, since astaxanthin has a high temperature sensitivity, an increase in skin temperature may cause vasodilatation when using the mask, resulting in redness on the face.
This doesn't happen to everyone. If you haven't had any previous experience with allergies to astaxanthin or other ingredients, you usually won't experience visible redness. However, if you have sensitive skin yourself or are allergic to certain ingredients, then using an astaxanthin mask may cause slight redness, irritation, or itching.
There are some steps you can take to avoid redness on your face. You can test it on your inner arm or behind your ear before use to see if an allergic reaction occurs. If there is no significant discomfort, then you can continue to use it. When using the mask, you can choose to use it at night so that even if you experience slight redness, you can gradually recover while you sleep. You can also choose mild skincare products to use with it to minimize skin irritation.
If you're really, really worried about redness after mask application, you can also consult a professional makeup artist or dermatologist for advice. They will be able to advise you on the right products for your skin type and needs and show you how to use the mask properly to avoid an uncomfortable reaction.
Astaxanthin masks are popular and well-received among many people as a skin care product. Although some people may experience redness on the face, it usually does not cause significant negative effects on the skin as long as individual differences are noted and it is used correctly. I hope my answer can help you!