I hit my head hard on concrete bottom of pool at waterside park on Saturday.  I had an instant lump and it is painful to the touch now three days later.  I had to take a flight for work 6 1/2 hours.  When should I be concerned?  My head is still very sore to the touch.
Hi, dairy have gone through your question. I can understand your concern. You have history of trauma.  You may have hematoma formation. Furthermore, you should take analgesic plus anti-inflammatory Chat Doctor.  Furthermore, you should go for ct scan brain to rule out any internal injuries or hemorrhage. Consult your doctor and take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health.