Is it likely the type of allergy causing allergic shiners could be a food allergy or a sinus or hayfever problem? my son has all year round?

See MD: Hard to say with info offered--allergic shiners are caused by sluggish circulation associated with venous blood vessel congestion--therefore darker color. See your doctor to check.

Allergic Shiners: Generally indicate sinus or a hay fever problem. Try to insure good sinus drainage with gentle saline and consider Singulair (montelukast) or an intranasal steroid. All the best.