Hello thanks for consulting at hcm..
What you are having is called pericoronitis- inflammation of gums surrounding the wisdom teeth.. or you could also have periocoronal abscess...
You need a iopa radiograph to check for level of impaction
of wisdom tooth.. you also may need antibiotics and analgesics if it is pericoronal abscess
the skin removed is nothing but pericoronal flap covering the wisdom tooth..
After radiograph, if space is not there, go for extraction of that wisdom tooth..
kindly consult a oral surgeon for a check up and treatment,,,
Hope it helps,,take care,,,