Lol I just had situation where acid did triple standard damage to the head of my soldiers. Instead of 20 acid (or 10 after one tick) there was 60 acid applied (50 shown after one tick). So instead of 10 damage my soldier was expecting to receive 150 damage from single body part. 
There were also 3 other body parts affected, 2 with 40 acid and 1 with 20 acid. Little bit insane as for starting Arhron. 
Oh maybe I will mention that in total he would receive 270 damage, 110 in 1st turn, 80 in 2nd, 50 in 3rd, next 20 and 10. So still managable. But having heavy armor he should not get damage at all (previous assumption of 10 damage from head was miscalculation).