After shaving my beard i always get some red pimples on my neck "submandibular area".my friend advice me to use fucidin cream.is it useful for my case?

Maybe not.: Fucidin is for bacterial infection. If you develop (bacterial) folliculitis after shave, Fucidin might help. But if you have an irritation from razor blade, cortisone cream might do a better job. Or you may have a condition called pseudofolliculitis(caused by ingrown hair), a chronic stubborn problem, you'd better seek for dermatologist help, it's a little complicated(to treat).

Worth trying: This antibiotic cream may kill the bacteria contributing to the formation of your pimples.