I have been put on antibiotics due to a pimple on my penis which the doctor had thought was a ingrown hair .. It was irritated when I showed her then I started the 5 days course of antibiotics (flucloxacillin)and after the first 2 the swelling and pain died down considerably it feels like its almost gone but its got a tiny scab now and not sure what it is and sometimes when I lay down on my stomach i get a temporary burning feeling on the end of my penis but not at all when I'm facing up . Is this something to be worried about or do I have anything ?

I haven't had sexual contact with anyone in months and always use protection . Never had a problem like this so don't know how to deal with it .