Thanks for all these additional information.
I understand your concern.
I have reviewed your picture.
Well such mass under wound can be scar tissue.
And such numbness can be associated with damage to nerve while passing underneath the skin supplying to thumb.
And while the wound is healing, the nerve ending may come together and heal or sprout new connections but this might take several months.
I would recommend definitely to see your primary care doctor if the wound was sufficiently big to injure the nerve, and to treat the pain associated with the injury.
And if required a referral to hand surgeon can be advised.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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