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Published on: 8/20/2026
A hard lump between the anus and scrotum (the perineum) may indicate several conditions, ranging from benign to serious. Possible causes include:
Because these causes vary widely in severity, a medical evaluation is essential. A doctor may recommend a physical exam, imaging (such as ultrasound or MRI), or a biopsy to determine the cause and appropriate treatment.
Not sure whether your symptoms need urgent attention? Waiting can delay treatment for serious conditions, while unnecessary worry can be avoided with a quick assessment. Take a free, instant, online symptom check to better understand what may be causing your lump and get clear guidance on your next steps—no signup required, and it only takes a few minutes.
Reviewed for medical accuracy: 07/15/2026
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When you feel a hard lump in the area between your anus and scrotum, it might be caused by different things. Sometimes, a lump like this can be a benign (non-cancerous) growth such as a lipoma, which is made of fatty tissue, or a fibroma. However, other times it could represent a more serious condition such as a soft tissue tumor or, in rare cases, an infection that has hardened into an abscess.
The best approach is to have it evaluated by a doctor. If you're experiencing unusual symptoms and want to better understand what might be causing them, you can start by using a free AI symptom checker to help identify possible conditions before your appointment. The doctor will ask you about any other symptoms you might have, e.g. pain, changes in size, or any redness around the lump. They will perform a physical exam and might order imaging tests like an ultrasound or MRI to see what the lump is made of.
In some cases, a small sample (biopsy) may be taken to rule out any serious condition. Getting a proper evaluation is important to ensure that nothing harmful is being overlooked and to guide the right treatment if needed.
(References)
Nassif MO, Trabulsi NH, Bullard Dunn KM, Nahal A, Meguerditchian AN. Soft tissue tumors of the anorectum: rare, complex and misunderstood. J Gastrointest Oncol. 2013 Mar;4(1):82-94. doi: 10.3978/j.issn.2078-6891.2012.042. PMID: 23450454; PMCID: PMC3562632.
Bruketa T, Majerovic M, Augustin G. Rectal cancer and Fournier's gangrene - current knowledge and therapeutic options. World J Gastroenterol. 2015 Aug 14;21(30):9002-20. doi: 10.3748/wjg.v21.i30.9002. PMID: 26290629; PMCID: PMC4533034.
Sigmon DF, Emmanuel B, Tuma F. Perianal Abscess. [Updated 2023 Jun 12]. In: StatPearls [Internet].
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