What could this be?!?

Earlier this morning I noticed this on my left wrist, the blister was a lot smaller and it has grown quite a lot since (as seen in pic). There is a red circle around it and then just the blister. It was very hot a few days ago- could it be sunburn that I’ve not noticed? Even though it’s on a tiny patch? Or could it... show more Earlier this morning I noticed this on my left wrist, the blister was a lot smaller and it has grown quite a lot since (as seen in pic). There is a red circle around it and then just the blister. It was very hot a few days ago- could it be sunburn that I’ve not noticed? Even though it’s on a tiny patch? Or could it be something else? Thanks.
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