It certainly would be unusual for a 49 year old to develop cystic acne. Chloracne is caused by exposure to oils used in industry, which I assume does not apply to you. I cannot think of any relationship of acne or pimples with swollen ankles. In addition, white stuff does not just 'pop' out of the neck unless you squeeze it out. If you are touching, rubbing, or squeezing any of your spots, you must stop this at once, or else you won't improve no matter what treatment you're given.
I am quite sure you have not been poisoned. You need to be evaluated by a general physician for your ankle swelling and pain. You should also continue to consult with your dermatologist. Please do not do any more internet research--you will not get any useful answers that way; all you'll get is further cause for anxiety, which may be significantly aggravating your problem.
Good luck.
Dr. Rockoff