Longan
Quick verdict
Status: unknown - for your review.
Confidence: low (AI-prepopulated from general food properties, not your own reactions).
Claimed concern
Longan (Dimocarpus longan, Sapindaceae - same family as lychee and rambutan). Very high in sugar and regarded as strongly 'warming/heaty' in traditional use, anecdotally linked to skin flare-ups. Not a nightshade.
Observed reactions
Decision notes
High-sugar, 'heaty' fruit - a plausible flare trigger to trial in small amounts.