Bleeding near the tailbone is most commonly caused by a pilonidal cyst, a pocket that forms in the skin at the top of the buttocks crease. These cysts can fill with hair, debris, and bacteria, and when they become infected, they leak blood or pus through a small opening in the skin. Other possible causes include pressure sores, skin friction, or less commonly a condition called hidradenitis suppurativa.
Pilonidal Cysts: The Most Likely Cause
A pilonidal cyst sits right at the cleft between your buttocks, near the tailbone. Many people have one without knowing it. The trouble starts when the cyst gets infected, creating what’s called a pilonidal abscess. At that point you may notice blood or pus leaking from a small pit in the skin, along with swelling, pain, redness, and sometimes a foul smell from draining fluid.
Pilonidal disease is far more common than most people realize, and it skews younger. In a study of over 1,350 patients, 41% were female and the rest male. The average age at onset was about 15 for females and 17 for males. Prolonged sitting, friction from tight clothing, and coarse body hair in the area all raise the risk. Cycling, long drives, and desk jobs can make things worse by putting steady pressure on the coccyx region.
Other Reasons Your Tailbone Area May Bleed
Pressure Sores
If you spend long stretches sitting or lying in bed, the skin over your tailbone can break down from sustained pressure. Pressure ulcers progress through stages. In the earliest stage, the skin stays intact but looks persistently red. By stage two, the outer layers of skin have worn away, and you may see an open, shallow wound that bleeds. Stages three and four involve deeper tissue loss, sometimes reaching muscle or bone, and can produce a foul smell. These sores are most common in people with limited mobility, but anyone who sits on a hard surface for hours at a time can develop early-stage skin breakdown.
Friction and Minor Trauma
Sometimes the explanation is simpler. A hard fall directly onto the tailbone can break the skin or cause bruising that seeps blood. Activities like water slides, snowmobiling, and horseback riding deliver sudden jolts to the coccyx that can injure the overlying skin. Even repetitive low-grade friction from cycling or prolonged sitting on a firm seat can chafe the skin in the buttocks crease until it cracks and bleeds. Moisture from sweat makes this worse, since damp skin is more vulnerable to breakdown.
Hidradenitis Suppurativa
This chronic skin condition affects areas where sweat glands are concentrated, including the buttocks and the crease near the tailbone. It produces recurring deep abscesses and nodules that drain blood and pus. Over time, sinus tracts (tunnels under the skin) can form, along with scarring and linear ulcerations. Unlike a pilonidal cyst, which typically involves a single pit near the midline, hidradenitis suppurativa tends to cause multiple lumps on both sides of the crease and recurs in cycles. It is primarily diagnosed by its appearance rather than lab tests.
Tailbone Bleeding vs. Rectal Bleeding
Location matters when figuring out what’s going on. Pilonidal cysts and skin wounds bleed from the surface of the skin, usually at or above the top of the buttocks crease. You’ll typically see blood on your underwear or when you wipe, and you can often spot a visible pit, lump, or raw area on the skin itself. Rectal bleeding, by contrast, comes from inside the anal canal and shows up as blood on toilet paper, in the bowl, or mixed with stool. Conditions like anal fissures or hemorrhoids cause rectal bleeding, not surface bleeding over the tailbone. If the blood is clearly on the skin surface near the top of the crease, the cause is almost certainly a skin-level problem rather than a rectal one.
Signs the Bleeding Needs Prompt Attention
A small amount of blood-tinged drainage from an obvious skin irritation isn’t necessarily an emergency, but certain signs point to an active infection that needs medical treatment. Watch for increasing redness and swelling around the area, skin that feels hot to the touch, thick or foul-smelling discharge, and fever. An infected pilonidal cyst that isn’t drained can worsen quickly, and deeper pressure ulcers can become serious infections if left untreated.
How Pilonidal Cysts Are Treated
Small, mildly infected cysts are sometimes managed with warm compresses and antibiotics, but most abscesses need to be drained. This is a quick procedure, usually done in a clinic with local anesthesia. For cysts that keep coming back, surgery is the next step. The two main approaches are minimally invasive techniques (like pit picking, where just the sinus openings are removed) and flap procedures that reshape the skin to prevent recurrence.
Recurrence rates depend heavily on the technique and the surgeon’s experience. In clinical trials, one common flap technique showed five-year recurrence rates between roughly 2% and 9% at centers that perform fewer than 30 cases per year. A different flap method showed three-year recurrence rates between 5% and 11%, depending on the surgical center. The takeaway: pilonidal surgery works well for most people, but the condition can come back, so choosing an experienced surgeon matters.
Caring for the Area at Home
Whether you’re managing a small wound or recovering from a procedure, the basics are the same. Wash the area daily with warm water and pat it dry gently. Skip hydrogen peroxide and rubbing alcohol, both of which slow healing. If the wound is weeping or rubbing against clothing, cover it with a gauze bandage and change it daily. Keep the area as dry as possible, since moisture encourages bacterial growth and skin breakdown.
If you’ve had a pilonidal cyst drained or removed and the wound was left open to heal from the inside out (which is common), you’ll need to change the packing or dressing on the schedule your doctor sets. Open wounds in this area can take several weeks to fully close, so patience and consistent wound care are important. Avoiding prolonged sitting and keeping hair trimmed or removed from the area can help prevent recurrence.