Welcome to the board of health care magic.
By going through your all your details I concluded that, you are suffering with GIT amoebic infection and acne vulgaris
Acne vulgaris has nothing to do with the infection of stomach.
Your stomach infection
can be confirmed by stool routine examination and can be treated effectively with full course of anti amoebic drugs.
Regarding acne vulgaris usually this is related with Harmonal disturbance of puberty
. It continues for some years then gradually it subsides.
Root of facial hairs are having a sebum producing glands, this sebum production is increased during adolescence and is secreted outside by a opening over face. This opening gets blocked by dirt, cream, oil etc and becomes a small lump called as acne.
One bacteria is also associated with this problem called as P Acinis. That is why here also is a need of an antibiotic which is to be given for a long time to control the symptoms.
Regular face wash, No oil or cream application help a lot.
Hope your query is answered with your satisfaction and is useful to you .