My theory on skin diseases is that alot of them
are related to dysbiotic flora.
As you mention you were on Antibiotics alot, I believe
that could be the cause.
The only way to restore intestinal flora is with a fecal
transplant of HPI. I would start looking there.
Its my believe if you ahve gut dysbiosis, then even though
the right diet & supplements help, you can never shake
the condition because it starts in your large intestine &
as of today there is no way to repair damaged flora with
the procedures I mentioned.