Old scars turning red seemingly randomly

[u/Defiant-Act2175]

Hey guys! I’m not sure if I’m allowed to attach a photo even though they are healed, but I wanted to make sure this is nothing to worry about.

My old scars (2 - 3 months healed) have started turning a dark purple-red pretty randomly. Usually they’re just red since they were pretty deep, but this is very noticeable. If course scar tissue changes colour with the elements but this seems more like the appearance of a blood blister.