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Age and gender?
Are you diabetic ?
Are you taking any medications like blood thinners ?
Do you have fever?
Can post a picture here ?
I guess you have developed a hematoma( collection of blood) which is inflamed now.That is why it is causing pain and it is warm.It can get infected too gradually.
It is better to see your doctor who can confirm the diagnosis and start you on anti inflammatory drugs and antibiotics as well to cover for any infection.If there is a collection it has to be let out.Proper imaging like ultrasound or CT/ MRI have to be done before any procedure.
Warm compress will help reduce the inflammation in the time being.
Motrin/ aleve will help relieve the pain.
I hope this answers your question.
If you have more doubts,, please let me know.
It is difficult to predict how this swelling will behave in coming days.Only clinical examination by a doctor will shed more light.
Warm compress and anti- inflammatory drugs will help in the mean time.
If it is a short trip then you can go, otherwise see your doctor as early as possible.