Lead: a lot of MM like to use the mask due the feeling of the essence into skin is super and the magic efficacy after applying mask. But, did you ever have the following mistakes while applying mask.
Applying the mask every day and the skin become more and more fragile
Most of mask is easy to lead the redness and sensitive of skin if using frequently. In fact, it is enough that 2-3 time per week. And then can reach the best efficacy of mask.
The thicker of mask and the better of efficacy
Does the thick of mask decide the nutrition it has? The answer is no. Too thick mask will block the breath of skin and then the skin is easy to have allergic phenomenon.
The time for apply mask is longer and the efficacy is better
The time for applying mask should be 15-20 minutes and the skin will absorb enough nutrition during this period. Otherwise, the moist of skin will back if exceed this limitation. 
Using the facial mask instead of neck mask
It is common that using facial mask to apply neck after apply face for saving the time and processing of applying neck mask. In fact, only choose the professional neck mask or use new mask can reach the efficacy of moistening neck.