Does anyone know what this could be?

chloe

So I had this odd rash appear on my inner thighs about 3 weeks ago now and it still hasn’t gone. It doesn’t hurt or itch and the red dots aren’t raised. It has seem to spread slowly over the last 3 weeks and is now covering at least half of each thigh. I had something that looks the same on my arm a couple months ago but that didn’t spread and only lasted about a week before disappearing. I haven’t used anything different on my skin like body wash or lotion. So I was just wondering if anyone had any idea what this could be and what could be causing is as with covid I don’t want to go to the doctors as it’s doesn’t seem to have any side effects so they probably wouldn’t want to know.