I have lipoma on my shoulder, i applied pressure to it and tried to pop like a pimple. it sprayed a fowl smelling substance for a month. is this safe?

Lipoma: The lesion you mention may not be a lipoma. Typically, a lesion of the skin and skin structures that expresses foul-smelling substance is a epidermal inclusion cyst or sebaceous cyst. These are benign lesions, but can become infected. You should seek medical attention and have this looked at as you may require antibiotics and then removal.

Unlikely: Lipomas are benign soft tissue tumors in subcutaneous tissue, most likely you have infected sebaceous cyst infected cheesy material is coming through best thing you can do is to see your doctor, get it drained or even better removed.