15 days after HT, bumped my head and got small swelling on head after 2 days swelling started at other place, advice?

Complications after hair transplant surgery are rare when it is done by an experienced, competent and ethical doctor in the correct environment with appropriate infection prevention and control measures. The bumps in your photo are not normal and the pus you mention suggests an infective cause. The bumps are likely to represents abcesses which need surgical drainage. You should seek urgent medical attention.Because you had your surgery abroad you will not be able to see the doctor who did your surgery which is one of the problems with medical tourism.

What I am looking at does not look like the results of a bump on the head but rather multiple cysts or abscesses in the recipient area. Have your surgeon examine you and take the next step