What Causes Anal Itching And Dryness?

i am 19 year old female with good health Since tham in good physical health with one exception, my anus itches all the time and I don't know why. I can take a shower and shortly after (sometimes within 5 minutes) I'm itchy. I can wake up the next day and I'm itchy. Recently, I noticed after I scratch I have a layer of dry, scaly skin under my finger nails and when the skin comes off, it gives off a very bad odor. Also, the itching can get so bad I draw blood, which makes it burn when I wash and is very painful when I wipe after using the restroom. What could cause all of this? I know this is my health, but it's still very embarrassing, which is why I haven't went to the doctor yet. is query is directed to our panel of specialists and super-specialists, please mention your problem in as much detail as possible. Do not forget to highlight your Age, Gender, Medical History and Treatment History of the problem you are facing.