I have 8mm cyct on my right shoulder. what's the treatment? do i need surgery?

Let it us see: 8 mm cyst on the shoulder could be a lot of things like lipoma( fatty tumor) epdermoid cyst( superficial cyst from the skin), muscle hernia. All of these kinds and other should be look at and most likely taken out. Thank you and good luck.

Unlikely: Small lesions that are not growing, are not painful, and are soft generally can be watched. Have a medical professional evaluate it first.