hello
welcome to hcm
well,there are many possible causes which can lead to intense itching and burning sensation in the anus and surrounding anal region , the possible causes are --
(1)
PINWORMS INFESTATION
(2) CERTAIN FOODS LIKE SPICES AND PEPPERS as these contains certain chemical compounds which reacts with the mucousal lining of anus and
rectum causing extreme burning
(3) CONSTANT AND EXCESSIVE MOISTURE caused by conditions like chronic diarrhoea/crohns disease/bowel
incontinence can also cause intense itching
(4) YEAST INFECTION
(5) REPEATED INFECTIONS DUE TO DIABETES
(6) HEMORRHOIDS
(7) ANAL FISTULAS can lead to constant dripping of fluid causing excessive and continous moisture around anus
(8) ANAL FISSURE
(9) LOCAL SKIN GROWTH CALLED AS SKIN TAGS
(10) SKIN CONDITIONS LIKE PSORIASIS
the best and most appropriate action from you should be that you should visit a surgeon who will perform a local and general physical examination and may ask you to get some required tests done to diagnose the precise underlying cause and will treat accordingly..see,its of no use to keep on taking medicines blindly which finding the underlying cause,the correct approach is to find and underlying cause for you problem and treat that effectively
i hope you will find my advice to be helpfull
take care
hcm.