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It could be a bone spur if hard or a cyst. ANY lump should be checked out by your doctor so get it checked right away. It's probably nothing, but if it bothers you it's probably pressing on a nerve so have it removed if possible.

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βˆ™ 17y ago
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βˆ™ 16y ago

Generally speaking, these "pea-sized" lumps are plugged up oil glands (there are a lot in that area)... The skin can over-grow an oil gland, but the glands continues to secrete oil; the gland will swell as the oil builds up --which becomes mixed with the internal skin cells sloughing off the inside wall of the "lump". When this happens, we call them "sebaceous cysts". (a cyst by definition is a fluid-filled sac)... They are not dangerous, but occasionally one will become irritated and sell even more. When it ruptures (usually because you squeezed it) a cheezy-sour smelling material will come out... The material is the oil & internal skin cells I mentioned earlier... The problem with these cysts is that once formed they will periodically swell & drain until a surgeon cuts the sac out. If they don't get ALL of the wall, the cyst will re-form and continue to periodically swell and drain...

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βˆ™ 15y ago

Many things. There are thelumps that happen when the head gets hit - they're bruised and tender to the touch and go away within a couple of weeks. Sometimes a blood vessel can be broken with trauma and cause a "leak" or hematoma under the skin. Anytime your head gets hit hard enough to cause that to happen, you should get it checked, in case you've damaged your skull or the grey matter beneath it. There are also cysts that occur often on the scalp called sebaceous cysts. They can get inflamed and tender, but tend to grow slowly and are usually not super-sore. They are full of fats and other cells from the skin and if they get too large or they get infected they can be drained. If they get infected they need to be treated or they could spread and become cellulitis. There could also be lesions that could be or become cancerous, so if you have a lump on your head and you haven't hit your head lately, keep an eye on it and get it looked at if it gets bigger or seems very tender, hot, and swollen, or if it grows quickly, regardless of whether or not it is sore.

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emarian

Lvl 3
βˆ™ 3y ago

Lumps, bumps, or growths under your skin aren’t uncommon. It’s completely normal to have one or more of these throughout your life.

A lump can form under your skin for many reasons. Often, lumps are benign (harmless). Specific traits of the lump can sometimes tell you more about possible causes and whether you should have the lump checked out by your healthcare provider.

Read on to learn more about common causes of hard lumps under your skin and when it’s a good idea to have it checked out.

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Q: What causes a small pea sized hard lump in back of neck on hair line no pain?
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