Did your doctor prescribe something for your "infection type of acnes (much more serious)." As in an oral or topical antibiotic or some form of treatment for your condition and did you get relief from the treatment.
Did the doctor do full spectrum allergy testing? or at least try to identify a sensitivity to PG/VG?
Do these break outs coincide with any other life stresses or hormonal cycles.
Might be experiencing a reaction to a flavoring component considering most if not all beauty products, lotions, creams, cosmetics, acne treatments, shampoo, toothpaste ect contain PG, many contain VG as well.
An aggressive skin care regime would likely put your skin in more direct contact with PG & VG that you could get from years of vaping.
Some people just can't vape for one reason or another, kinda like some can't eat peanuts, honey or shellfish.