My female tabby that is about 14 yrs old has a lump on her head that is protruding out from her fur. I can touch it and it does not hurt her. Sometimers in goes down a littlle smaller than comes back up again. Seems to be liquid filled and does not bother her. She seems fine otherwise but has lost a little wight in the last little while , but seems to eat and go to bathroom just fine and still has some spunk to her. She has a playmate that is about six years old and still plays with her. Any opinions.