Someone pricked something like syringe I do not know what that was but I feel something pricked in my lowe back and no blood come outside after 1 hr the skin around the pricked area burn and skin comes outside and after that 60 hours I started pep art drugs for hiv is it is helpful in prevention to hiv transmission and the syringe not go deeply in body it just touch nd I feel but no blood contact happen now what should I do.