I’m exactly the same… plagued on my chin. Trying everything but the constipation isn’t happening.. those toxins have got to get out somehow and unfortunately, it’s our skin which takes the rap.
Have to tried going for a steam facial with an extraction? Or go and see a skin care specialist?
I’ve booked myself in for one this week cause I just can’t take it anymore. Maybe do a small course of them. It’s probably blocked pores and the change in seasons doesn’t help.
Failing that, lots of fruit and water 
Hope it gets better soon xxx