Brief Answer:
Can be infection of 3rd molar erruption

Detailed Answer:
Hii, first of all thank you for approaching us for your query. I read through your query and I suggest you nothing to be worried in this case. Itcan be due erruption of third molar of lower left side(wisdom tooth). Isuggest you if you can send a pic of intra oral(inside oral cavity) of that area, We can reach a better conclusion and can suggest you more clearly about the treatment plan. Hopeyou understood what I meant. Thank you and have a healthy day. DrRohit

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Brief Answer:
Can be a third molar infection

Detailed Answer:
Hii thanks for your followup. Its sad that you couldnt upload the picture.Pls send the pics as to this mail id: YYYY@YYYY the symptoms told yesterday it can be infection of errupting molar(wisdom tooth). I suggest to do warm salt water gargle concentrating on that side.Also do warm water pack from outside on that area and try to open and close the mouth twice or thrice(infection can sometimes cause reduce opening of mouth so in order to prevent that follow this).Also take amoxicillin and anti inflammatory so that the pain will reduce. In meantime please visit your dentist and get the checkup done. Hope you understood what I meant. Stay calm and be happy.Please do review my answer so that I can improve answering in future. Thankyou and have a healthy day.

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