Hi and welcome.
Please attach a photo here.
Thanks for the reply.
This could be a splinter or a foreign body, but can not say for sure on the picture. If there is inflammation and swelling around it and if it hurts to touch on the area, then that is what it is. If not a splinter causing localized cellulitis then a skin lesion can not cause the whole big tow to swell, and the most likely cause is joint inflammation, usually arthritis presents with morning stiffness and the pain gets better as the day goes on and the joint is mobilized. I would suggest that you see your PCP for this to evaluate it further.
Let me know if you have further questions.
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Wish you good health.