I have had a hydra facial yesterday( 1st time) . I have mild pigmentation issue, therefore, I was advised  to apply Kesar and Kojic Acid Serum with Azilight lotion last night. I applied the same as instructed and slept. This morning, when I woke up my face was all swollen and red. But when both the products were tested on my hands today as a patch;  there was no reaction at all, both individually and in combination. Therefore, what causes the bad reaction? Was it due to the side effect of Kojic acid? Should I avoid using Kojic acid at all cost or was it because it was used after having a facial? Please guide. PS: This was the first time I used both the products.