A perianal haematoma can be distinctly uncomfortable, and may leave you feeling worried or embarrassed, as well as in pain. A perianal hematoma is a blood blister that collects in the tissue surrounding the anus, similar to when you trap or hit your thumb with a hammer. It is usually caused by a ruptured or bleeding vein that occurs when the bowels are opened, and it only occurs on the outside of the anus, as opposed to being an internal issue. It can also be painful, particularly when passing a stool.
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Sounds horrible right?!?! Watch out bloggers! Pilonidals can go dormant for years at a time, lulling their owner into a false sense of escape. It effects males slightly more than females. Everyone has a Pilonidal sinus opening in their butt crack.
A hematoma , also spelled haematoma , is a localized bleeding outside of blood vessels, due to either disease or trauma including injury or surgery  and may involve blood continuing to seep from broken capillaries. A hematoma is benign and is initially in liquid form spread among the tissues including in sacs between tissues where it may coagulate and solidify before blood is reabsorbed into blood vessels. A collection of blood or even a hemorrhage may be aggravated by anticoagulant medication blood thinner.