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The condition experienced by your father can occur related to surgery or it can also be another condition. So for further physical examination and if necessary support will be better, especially if it is done on the doctor who performed the surgery first /
Some things are possible
Skin infections by bacteria Lipoma or lumps in the form of fat cysts filled with fluid Shifting from the installation of the tool This can be done several things to reduce symptoms
Compress with a cold towel Give a cushion when leaning Avoid activities that lift or weight Thus information May be useful