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Based on your picture and the history you have given it doe seem suspicious of psoriasis. I would say you should see your GP for evaluation and perhaps consider a trial of steroid cream of calcineurin inhibitor creams (tacrolimus) and see if it improves. Other possibilities include some types of eczema and fungal infection it can also be a result of excessive scratching causing the skin to overgrow (may have started as a simple insect bite and progressed).
The evaluation typically requires more history and examination for other similar rashes. If treatment fails, we would usually refer your to a dermatologist who may do a wood lamp examination together with some other tests.
Hope this helps!