Based upon your description, this lump is most likely a thrombosed (clotted) external hemorrhoid, but it is impossible to make a specific diagnosis over the Internet. In most cases, thrombosed external hemorrhoids will resolve over a few weeks time. Therefore, if this bump persists for more than 3 or 4 weeks, then you should let your GP take a look. Also, you might try and increase the amount of fiber and water in your diet, as well.
Sincerely/ Robert A. Wascher
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