My mother had been diabetic for more than a decade and she is 74 yrs of age & live in Philippines. She saw an ENT today & was been told that her small bump on the head that grow bigger if her sugar is high and ooze some watery fluid might be a cancer...also, she was complaining about her eyes and when the doctor give her an eye drop, the doctor says that her eyes had a big problem for there was some blockage....I got this info from my brother thru phone but was cut off....pls help and educate me..thank you ...
The bump on the head, I assume is bony hard maybe a spread of cancer to the skull bone. Since you've got the information from your brother over phone, it is minimal.  I would like to suggest that she be further evaluated to find where the cancer originally comes from (the primary site). Mostly it will include biopsy of the lump and screening of various body systems with CT imaging.