You seem to have got a little sun reaction called Polymorphous light eruption Your medication Lamotrigine does make you a little more sun sensitive, but as this can’t be stopped and may not be the only reason
I would suggest that you apply a good physical sunscreen (containing zinc oxide/ titanium dioxide) at least 20 mins before you step out or enter the pool
Make sure for water activities the sunscreen is water resistant and doesn’t get washed off on contact with water
Currently to soothen the skin you can use a hydrocortisone cream, that would be a available over the counter, twice a day for 5-6 days and keep the area moisturised well with a body lotion (repeated applications). The skin eventually gets dry (so keep moisturising) and recovers.
If you are very itchy you can take an antihistamine, but mostly may not be required if you moisturise well. Hope this was helpful
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