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This is is Dr. David
this could be an early anal fissure.
or an fungal infection
fungal infections often will itch and like to grow in dark warm moist environments.
would you like to upload a clear jpg photo of the area so I can better help you?
here are instructions to how to upload a photo
type a word in the textbox and highlight it
then select the "chain" icon above the textbox or the paper clip icon to upload a jpg
this opens a window where you can click next to the text box to select the jpg or pdf file on your computer to upload into JustAnswer