How long should I wait before doing bodybuilding exercises after hair transplant? What happens if I do bodybuilding exercises ?

Thanks for posting your photos. My recommendation to you will be to contact your surgeons and to consult your situation. After a hair transplantation these kind of reactions can be seen and it is common but important is to treat them right and on time.

There is a risk of getting HIV or hepatitis with any surgery if sterile instruments are NOT used.  In an ideal world all medical practices should be using precautions to protect their patients and staff.

If you are having issues after surgery, especially with "itchy scalp" you should contact your doctor.  You may not be washing your scalp well enough.

Photos cannot assess if you would be a "good" candidate for surgery.  Usually this involves seeing a doctor in person so you can discuss your goals and understand what can be expected after an examination.

Onion just has nothing to do with hair transplants.  You can drink it do what you may want to.  You may want to ask your doctor if you are concerned.

It can take 6 to 12 months after surgery to see results.  If you are concerned it is best to contact your doctor.   It would be very rare if you have hair growth in 2 weeks.