Hi,About a month ago I slipped and bumped my head - the lump was about 1/2 the size of a cricket ball - I could only just cup my hand over it.  There is still a lump there and its still tender and numb - i live in a remote commnunity and its not easy to get to a doctor - I would have to fly to the nearest city which is about 500km away.
HiT hanks for your query and an elucidated history about the cause and size of the bump and your inability to get an attendance by a medic at your place. The lump which you have is called a hematoma, that is collection of the blood under the skin of head called a scalp. The treatment is simple:Aspiration of the hematoma may solve your problem, and you just need a wide bore sterile needle and a large syringe and the nurse or any para-medic can do this for you. Please remember to apply a very tight Chat Doctor. Take care.