How to Remove Fluid Already Collected Under Skin

i did the operation for removing a lipoma one month ago the last two weeks i felt there is fluid collected under the skin which i feel not comfortable there is no drainage done for me after the operation and i don't know how can i treat this and it's dangerous , what i should do to release this , what about the exercises or some treatments please advise me as soon as possible due to these made me worry a lot today

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