A squishy feeling on the head is usually caused by something in the soft tissue between your skull and skin, not a problem with the bone itself. In babies, the most common explanation is a fontanelle, the normal gap between skull bones that allows the brain to grow. In older children and adults, the squishy spot is more likely a cyst, a lipoma, a swelling from an injury, or, less commonly, an infection. What it means depends on your age, where the soft area is, how it feels, and whether you recently hit your head.
Soft Spots on a Baby’s Head
If you’re feeling a squishy area on an infant’s skull, you’re almost certainly touching a fontanelle. Babies are born with several gaps between their skull bones, covered by a tough membrane that feels soft and slightly yielding to the touch. The two most noticeable are the anterior fontanelle (the diamond-shaped one on top of the head) and the posterior fontanelle (a smaller, triangular one near the back).
The posterior fontanelle closes within about six to eight weeks after birth. The anterior one stays open much longer, typically closing between 13 and 24 months of age. During that window, it’s completely normal for the top of your baby’s head to feel soft. You may even see it pulse gently with the heartbeat. A fontanelle that bulges outward when the baby is calm or one that appears deeply sunken can signal a problem, but a flat, slightly soft spot that moves a little when touched is exactly what it should feel like.
Birth-Related Swelling in Newborns
Newborns can also develop squishy bumps from the delivery itself. Caput succedaneum is a diffuse, puffy swelling of the scalp caused by pressure during birth. It spreads across the head without respecting the boundaries between skull bones and usually resolves within a few days on its own.
A cephalohematoma is a more defined bump that sits on top of one skull bone and doesn’t cross the seam between bones. It starts firm, then becomes increasingly soft and fluid-feeling over time. As the collected blood gradually calcifies, it may actually feel harder weeks later before eventually flattening. Cephalohematomas typically resolve within a few weeks to months without treatment.
A subgaleal hematoma is less common but more serious. It feels like a boggy, fluid-filled swelling that can spread across the entire scalp and even shift position when the baby’s head moves. If a diffuse, squishy mass develops over a newborn’s scalp and keeps growing, especially with swelling around the ears or eyelids, that needs urgent medical evaluation.
Scalp Cysts in Adults
For adults and older children, the most common cause of a squishy lump on the head is a cyst. The scalp is a particularly common location for pilar cysts, which develop from cells in the hair root. They feel like round, dome-shaped bumps sitting just under the skin, ranging from smaller than a pea to several centimeters across. They’re usually painless, skin-colored or slightly pale, and they move freely when you press on them.
Despite being widely called “sebaceous cysts,” most scalp cysts are actually pilar or epidermoid cysts, not true sebaceous cysts. Both types contain a thick, white material made of keratin (the same protein in your hair and outer skin). Because of this semisolid filling, they often feel slightly firmer than a purely fluid-filled swelling, though they can still feel distinctly squishy compared to the hard bone underneath. Most scalp cysts are harmless and grow slowly over months or years. They occasionally become inflamed or infected, at which point they turn red, tender, and warm.
Lipomas and Other Soft Lumps
A lipoma is a slow-growing collection of fat cells that can form under the scalp. On the head, lipomas tend to be elliptical rather than perfectly round, and they feel softer and more yielding than a cyst. When doctors compare the two, cysts feel more “fluctuant,” meaning they give slightly under pressure like a water balloon, while lipomas feel uniformly soft and doughy. Lipomas on the scalp are relatively uncommon, with estimates of 2 to 14 percent prevalence, but they’re benign. They don’t need treatment unless they’re bothering you cosmetically or growing large enough to cause discomfort.
Squishy Spots After a Head Injury
If your head feels squishy after hitting it, you’re likely feeling a scalp hematoma, essentially a large bruise where blood has pooled beneath the skin. The scalp has a rich blood supply, so even a moderate bump can produce an impressive, fluid-feeling swelling. These generally feel boggy and tender, and they can take a week or two to fully resolve.
In children under two, the location of a scalp hematoma matters. Research from PECARN, a major pediatric emergency care network, found that hematomas on the back or sides of the head (the occipital, parietal, or temporal areas) carry a higher concern for underlying injury than hematomas on the forehead. For children two and older, hematoma location is less predictive on its own.
A large, boggy hematoma can also mask a more serious problem underneath. Depressed skull fractures can sometimes be felt as a “step-off,” a spot where the bone dips inward rather than following its normal curve. But when significant swelling sits on top, that depression becomes much harder to detect by touch alone. If a squishy area developed after a significant blow to the head, particularly with confusion, vomiting, or worsening headache, imaging is the only reliable way to rule out a fracture.
Signs That Point to Infection
A scalp abscess can feel squishy because it’s filled with pus beneath the skin. What sets it apart from a cyst or bruise is the combination of symptoms: the area typically looks red and raised, feels warm and tender to the touch, and the skin over the center may appear thin, yellow, or white. You may also develop a fever or chills. Abscesses don’t resolve on their own and generally need to be drained. A cyst that was previously painless and suddenly becomes hot, red, and painful has likely become infected.
Rare Causes of Skull Softening
In very rare cases, the skull bone itself can thin or erode, creating a spot that feels softer than the surrounding bone. A condition called idiopathic focal skull thinning most commonly affects the parietal bones (the sides and top of the skull) and is seen more often in elderly women. Gorham-Stout disease, with only about a hundred cases reported worldwide, causes progressive bone loss through abnormal blood and lymph vessel growth, sometimes triggered by trauma. Other conditions that can create defects in the skull include certain metabolic diseases and bone tumors, but these are uncommon enough that they’re usually discovered incidentally on imaging done for other reasons rather than from someone noticing a soft spot.
If a squishy area on your head has been there for years, isn’t growing, and doesn’t hurt, it’s most likely a cyst or lipoma. If it appeared suddenly after an injury, a hematoma is the leading explanation. And if you’re asking about a baby, a fontanelle is the overwhelmingly likely answer. The texture, location, and timeline of when you first noticed it are the three most useful details for narrowing down the cause.