Hello and welcome to HCM.
Thanks for putting your query over here.
Rash around your anus may be due to
fungal infection.
If I were your treating doctor,I recommend,
-Topical application of antifungal plus corticosteroid ointment
-oral anti histaminics like cetrizine/
loratidine for itching.
-Oral antifungals like ketoconazole/
fluconazole may be given(prescription drug)
-Keep the area clean and dry.If there are lot of hair can shave or trim them.Use loose fitting and cotton undergarments.Wear undergatment only when the area is completely dry.
-Eat more of fibrous food ,drink adequate amount of water to prevent
constipation.Constipation,anal fissures more likely cause of anal itching.
-If it is associated with abdominal discomfort or bloating,hookworm/pinworm infestation may be suspected.
Stool test may be necessary.
-If still the rash persists or increase in size,possibilty of genital warts needs to be ruled out.Visit to surgeon will be necessary.
Thanks.