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Add link on lymphatic fluid
}}</ref> The length of time that it lasts after circumcision varies and is unpredictable, but it is not uncommon for it to last many months.
Blood is supplied to the penis by arteries deep within the penis. Blood is returned to the heart by veins in the [[foreskin]]. Circumcision severs those veins, so blood has difficulty in returning to the heart. This causes a buildup of [https://medical-dictionary.thefreedictionary.com/Lymphatic+fluid lymphatic fluid ] in the penis.
Swelling most commonly occurs in the residual internal mucosa between the [[glans]] penis and the [[circumcision scar]], but may also occur elsewhere.