This link shows what my hands look like most days.

Young Mom With APS .&. Erythromelalgia
Scroll down the first page ...

However, I don't have pain/burning with my red finger tips (the first joint). But my doctor thought it was significant anyway, perhaps a sign of my drug induced lupus.

But I have had some burning of my feet and up past my ankles, at times, esp in winter. I find my feet burn with nightshade
veggie intakes(and also with paprika seasoning). Also MSG is a huge trigger for me. The last attack was about 3 or 4 months ago and only was one night. My feet and lower legs were a bright bright red (not purplish like they can be at other times)

Most of the photos of erythromelalgia I have seen do not only affect small areas. Those photos show the whole foot, the whole hand.

Google erythromelalgia... some sites suggest using aspirin for it. I'd recommend the aspirin in the form of AlkaSeltzer original formula. I get the best pain relief from my arthritis and PN pain from aspirin, but I don't use it all the time. I use in pulses of once a day for up to a week with a rest period, so I don't get GI bleeding. AlkaSeltzer is absorbed quickly and doesn't hang around long to cause GI upsets.

Dr. Jay Cohen MD online has this disorder and claims it is a sign of excess serotonin, and he uses a serotonin blocker drug from Canada for his own. He also uses magnesium orally.

THE MEDICAL TREATMENT OF ERYTHROMELALGIA