On the local news here in suburbia MN they did claim that the disease is commonly linked with Covid-19 antibodies, which suggests that the child was exposed, was likely, but not always asymptomatic, but did have it. About a month after exposure (it is believed), the child spikes a fever and complains of body aches and has some signs of inflammation, sometimes a rash. They believe the correlation = caussation and are seeing this pattern with MIS-C diagnoses as of late.
I would imagine so called Covid Toe is related.
This would also help explain the seemingly more deleterious effects of Covid-19 in people who have autoimmune disorders that cause inflammation and where Hydroxychloroquine is also contraindicated (i.e. Ankylosing Spondylitis and psoriasis/psoriatic arthritis).
Unfortunately I belong to the group that has both (or all three if you want to go that far) contraindicated autoimmune disorders mentioned above. I take a biologic and a DMARD, both of which suppress the immune system response, so I might be a little more succeptible to Covid or other complications from it. The flip side is that since my immune system is suppressed, it might actually bode well for me WRT Covid-19 and the potential for immune system hyperactivity (cytokine storm).
Thats just my point. Commonly linked to doesnt mean caused by, and careful language like that makes me wonder whether any link has been established at all. There is an old legal axiom that temporal proximity, without more, is no evidence of causation. Just because this is happening during a Covid epidemic doesnt mean it is caused by or even related to the epidemic. Maybe these kids are being exposed to some environmental or behavioral conditions because of the lockdown, or maybe this is the result of some entirely unrelated source.
No rule that there can be only one epidemic at a time.