OK, but then my suspicion that you're on some kind of medicine that makes skin photosensitive is correct, and you have to look in that direction.
The Alimemazine you're taking is known for making the skin photo-sensitive so I would recommend stopping it immediately.
"Photosensitivity" is quite of an euphemism, really. "Photosensitivity" means that very harmful things occur in the skin when exposed to light, caused by the formation of highly toxic compounds.
The skin then reacts in various ways.
If you've been taking this drug for the past two years, then you may have developed increased sensitivity to its chronic exposure.
Alimemazine is know to be able to cause rashes and hypersensitivity reactions:
https://http://www.mims.com/USA/drug/info/alimemazine/Agents that have photosensitivity as their main side effect are of course the prime suspect in your case.
The patient's leaflet for Alimemazine says you should avoid direct sunlight:
Exposure to sunlight
"Alimemazine can make your skin more sensitive to sunlight. Keep out of direct sunlight while taking this medicine."
https://www.medicines.org.uk/EMC/pdfviewer.aspx?isAttachment=true&documentid=22488I am near-100% certain that the skin symptoms you report have nothing to do with microneedling.