I get a rash around my anal area almost every week that cuases a little rash and I notice its wet. Why is this happening?

Keep clean. Your stool and anal secretions can be irritating to the skin and perianal area. Use baby wipes to keep yourself clean.
Could be. From excess caffeine, excess perspiration or even a yeast infection. Try liberal frequent use of corn starch powder to bottom, eliminate caffeine, do notuse baby wipes as they have lanolin which will make the rash worse. Use kleenex cottonelle wipes or any wipe that has no lanolin, witch hazel or alcohol in them.