If it's close to the anus and you've ruled out herpes virus & other infections try changing the environment in your bowel. start with something like lindens 'MAX' probiotics which contain both pre & probiotics. Lanacane is good for anal itching & contains zinc to help fungal & bacterial issues. There's also a new one with a coolant.
You must have the sores looked at by a medical professional try to get a good photo to save your sensibilities or embarrassment. Some GP.s can diagnose from this but they may need a swab & allow you to obtain that for them.
If it was me I'd brave the 2 minute exam to get a correct diagnosis.
You can also use baby nappy creams.
Make sure any meds you take are not interacting. I had terrible fungal issues & black spots just because 2 of my meds were interacting.
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