Ozu
Oily/Sensitive
My skin was irritated with both Skin1004's ampoule. I first tried the Brightening Ampoule which caused slight redness. Then, I thought perhaps the pure Centella ampoule will work on me, yet it gave me burning sensation and my whole face was red. I posted a discussion back then specially for this issue and found out that the reason might be high concentration of centella. To be frank, 90% of my skincare routine includes centella, and I owned different brands' centella ampoule which give me great results. So, I agree with @qilss that it could be the formulation.
Or perhaps, you're sensitive towards high concentration of centella, I looked it up, and it is a thing. Maybe experiment with different reputable brands if you want to confirm your guess.

SKIN1004
Madagascar Centella Ampoule
4.7
(4173)
2670

SKIN1004
Madagascar Centella Tone Brightening Capsule Ampoule
4.6
(3901)
1766
5
0
qilss
Oily/Resilient
Yes I agree with the high concentration centella being the culprit too! Some skin just can't tolerate certain ingredients in high concentrations, similar to niacinamide and hyaluronic acid
3
0
qilss
Oily/Resilient
Cica is short for centella...so it's literally the same thing
Centella asiatica = cica
As for the stinging sensation, I think it probably depends on the product. I've experienced stinging with a centella ampoule from one brand when my skin is sensitised, but didn't have the same issue with a centella ampoule from another brand. So it really depends on the formulation and our skin's reaction
3
0
qilss
Oily/Resilient
Ah okay madecassoside makes sense. No it was the Of Base Centella Ampoule, which ironically looks really similar to the Skin1004 ampoule. It didn't sting initially, but when I started adapalene my skin became extra sensitive and that ampoule along with some other products, gave a stinging sensation. Those products doesn't sting as much now, as I get more used to adapalene but occasionally they do sting a little
OFBASE
Centella 101 Ampoule
4.6
(117)
47
1
0
vvyrzm
Oily/Resilient
Cica and centella asiatica is the same thing dear. Maybe its depend on the percentage
3
0
micho
Oily/Resilient
It's not unusual for people to develop allergic reactions to botanical ingredients.
2
0
