Seeking Info for My Grand Children

Do not guess at this.
The bottom line is: he needs to be taken to a Pediatrician.
Only then, can you get a proper diagnosis.
It can be ANYTHING.
For example:
http://www.pediatricadvice.net/2006/10/dark-circles-under...
http://www.livestrong.com/article/124604-dark-circles-und...

How long has this been going on?

Don't speculate.
Just get a Doctor's diagnosis.
Because, only a Doctor can do that.

A doctor is the only one who can answer this. It can be allergies or an illness, or normal.

Don't come to Mamapedia for medical advice...go to the experts...have Mom make an appointment with his pediatrician and find out for sure. It could be nothing...it could be something that requires attention.

This is not a "slam" on some of the other responses but why not ask other moms what they think or have they ever seen a particular issue with their children?

Isn't that what women have been doing since the beginning of time?

Of course mom opinions should never take the place of professional advice. But I don't have any objection to someone asking a question. Sometimes it can help generate questions TO ask the doctor.

I wish I'd had this site when my kids were little!

When I was working with infants, one of the baby's had something similar, and I was told that it was a sign of some kind of nutritional deficiency--nothing that would hurt him short term, but something to look into and correct for the long term.

Get as much info as you can before heading to the doctor. Maybe google the symptoms. Caring for baby is a team effort. Doctors are still learning, too; they just have a bigger head start. They know based on what they've seen before. Parents bring a different perspective, an individual case. Both perspectives are equally valuable.

I was misdiagnosed based on one doctor's experience and the fact that a particular medicine seemed to help. It took my familiarity with my own body and habits and my persistence and willingness to try some things on my own to get a more accurate diagnosis. Use ALL of your resources; this is NOT a dress rehearsal.

My daughter gets this. The doctor called them "allergy shiners". My child is 11 and she just uses drops daily during allergy season and sometimes Allergra tablets as well. She is only allergic for about 3-4 weeks at the beginning of the summer. Hopefully this will go away for your grandson. We also use a HEPA filter in her room at night and keep the windows closed to keep pollen out. For feeling more comfortable, we let her lay down on a towel and use a bottle of regular saline solution (I use the CVS sensitive saline) and drip a lot of this on the inside of her closed eye, which then runs like a little river to the outside and by her ears, she then blinks a few times and that seems to clear excess pollen from her lashes and eyes.

Doctor.

I can think of several dozen possibilities, but I can't see him and don't have a working lab to test my theories in even if I could see him.

My doctor once told me that bluish color under the eyes, can be a sign of allergies. I would ask your pedi, though. Good luck.

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That sounds like allergies. Two of my kids have that. If he often rubs his nose upwards with his palm, that's called the "allergic salute" and is another indication.
He could be tested for various allergies. Dust mites are common triggers. Whatever it is, I think it helps to stop drinking milk. For calcium, use an almond drink. That's helped my kids.
Blessings!