lump or swelling on forehead scalp after injury or trauma
When someone gets an injury on forehead or scalp, a bump is formed, if skin remains intact.
The reason of this bump formation or swelling is explained below. 
The skin of fore head and scalp is adherent to underlying bone and there is no space present between them. When a person receives a blow on forehead or scalp, either by an object or falling on a hard surface, it causes rupturing of the blood vessels inside the skin. If skin remain intact then the blood that oozes from the ruptured vessels has no place to go. It is collected under the skin and it creates a bulge, this bulge is called hematoma. It is not serious if it is formed out side the scalp and it resolves spontaneously within 2-5 days.

Is this bump on the scalp or forehead dangerous?

As it has been already stated that if hematoma or bulge is formed out side the cranium then there is no problem but If such hematoma or bulge produces on the inner side of the scalp bone then it may compress the brain tissue, in such circumstances, patient may present with nausea, vomiting, confusion, drowsiness, loss of consciousness and weakness of one or more parts of the body. In such cases, you need immediate hospitalization of the patient and evacuation of that collected blood by creating a hole in the cranium. 



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