skin reaction from taking mass gainer whey

Hi! For context, I’ve been consistently training in calisthenics for 5 months and currently take Athlene Lean Mass Gainer to hit my protein intake and gain weight. I managed to go from 59kg to 64kg in those months pero I’ve been getting what I believe to be a reaction sa supplement—acne sa chest and upper back. I doubt it has anything to do with hygiene as I always make sure to thoroughly clean myself naman after every workout.

I still want to continue gaining weight (target is 67-68kg ) while getting the optimal amount of protein pero kasi nagkaka acne talaga ako through consistent intake of said supplement. I’ve already tried yung mga salycylic soap wala talaga. Should I switch to another brand or type of whey? Please help a fellow bro out. Thanks!