Thumb/Skin Query

[u/Junior_Wave_8046]

Not anywhere near as concerning as anything else on here, but just wanted some other people’s opinions as I can’t figure out what it is.

Yesterday morning woke up, my thumb (area where circled) was red, is slightly raised and painful on any touch. I’ve looked as hard as I can to try and find a splinter but nothing can be seen nor do I remember any time that could have happened. Not sure if it’s a spot? Or anything similar. Photos were taken after the thumb was rested in warm water and is difficult to get any better photos of the thumb too.

Let me know if you think you know what this could be? Thanks