(CNN) A boy who grew out his hair for cancer survivors is now facing his own struggle with the disease.

Vinny Desautels' parents initially thought seasonal allergies were to blame for his puffy right eye. Rounds of tests revealed the 7-year-old from Roseville, California, is facing stage 4 cancer.

The family is awaiting final confirmation from doctors that Vinny has Ewing's sarcoma, a type of tumor that forms in bone or soft tissue. The second-grader is scheduled to begin treatment this week, starting with a bone marrow biopsy and chemotherapy, said his father, Jason Desautels.

"We know it's cancer, stage 4, because it spread in two different locations and it's aggressive," he said. "Now we're trying to figure out what we're dealing with so we can come up with a plan."

Vinny's eye started getting "squintier" in March, Desautels said. They tried prescription eye drops and allergy medication with no success. Vinny started complaining of an aching knee and his parents noticed his hip was swollen.

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