Symptoms
The first sign of this condition is the intense cravings for blue food. Because of all the blue food one eats, their tongue slowly tints to blue. Eating Roundleaf blueberry causes the tongue to tint faster, with the extra effect that their teeth and general mouth will also tint slightly.
When the afflicted does not eat blue, their mouth starts having a tingling sensation and shortly after the sneezings start. As more time passes without the afflicted eating blue food, the symptoms increase.
It is know that eating more Spotted redberry, or drinking tea from Sore elder leaves (a common tea for stomachaches or when throats hurt), causes the cravings to be more intense.
Treatment
There are a few different ways of treating Tingling blue. The most known one, for its high effectiveness yet expensive price, is to eat the purple "pearls" that grow in between the Spotted redberry's roots. Just eating two "pearls" with a two days period in between each one will leave the afflicted as if they never got the tingling.
Another treatment, which requires to avoid eating blue foods for a week, is also pretty known and while its harsh, it's much more cheaper and thus more common. It is know that drinking Sore elder's tea causes more cravings, but when drinking it while eating one blue berry, both of them cancel each other, making the afflicted not feeling the craving while also not feeling withdrawl; and it also makes the cravings take a bit longer to return. Thanks to this tea and berry effect, after taking it for a few days, the afflicted will be able to spend a whole week without eating blue food. Trying to spend a week without eating blue food without using the sore tea method is considered a torture.
What a sneaky sneaky berry.