What Causes Unexplained Bruise In Children?
Looks like a bruise. Wait and watch
Detailed Answer:
Hi there, thanks for coming to HealthCareMagic.com
I took a look at the picture you posted. It really seems like a bruise to me. Did you ask her if she fell or had an injury. If the spot is not painful, i'd think we can wait and watch. If its a bruise, then it should start clearing out and lightening up over the next few days. If not, then a doctors visit is on the cards.
Infections and the like are normally pretty painful and itchy.. so we can probably rule those out right now. When i zoom into the picture, i can't make out any bite marks, so insect bites are a doubt (though, sometimes a low resolution picture can miss things).
So to my mind, a bruise is still the top possibility, warm water compresses should help with clearing it up.
Let me know how I can assist you further in this regard,
Vinay