@turquoise-- I'm not a doctor so please don't quote me on this. This is just my opinion.
If the spots are slightly purplish, it's probably vasculitis but don't worry. This type of vasculitis is not serious and can be treated with blood thinning medications. It's internal vasculitis that we need to worry about since this type can cause serious damage to organs and blood clots that are very risky.
Also, there are more than one types of lupus. There is cutaneous lupus which affects skin and systemic lupus which can affect the skin and other organs. I think if you have the former, vasculitis is less likely or less dangerous. And many people with lupus experience vasculitis at some point so it's not rare either. So don't panic.