A bit of background, 4 Yr old came home last Sunday from dad's, gunky knee, cleaned, washed and dressed. Monday it popped, went to MIU confirmed he had something stuck in it. They used Duoderm and told us to come back Thursday. Forward to Thursday, they have confirmed everything is out and it should all scab over and be fine etc. However since Friday morning, these spots have started to appear. Some blister like, some puss filled. Its gotten warm over the last 24hr also. He complains it stings, I've been cleaning with a warm flannel etc. Hes currently sound asleep for the first time in days, so don't wanna disturb if I dont have to. The green line is so I can monitor whether its spreading also. The other imagine is thursday evening after the dressing came off.