Anal lesion

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mild itching and every time i sit down i feel like i am ripping the wound a little more. I don't have any other symptoms. Its been about a week and this wound doesn't seem to be healing/spreading. i do have a history of hemorrhoids. I do plan to get tested but wasnt sure what the best option was. Should i get a blood test or have a doctor look at my anus? Anyone have any guesses?