When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A cancer diagnosis is so difficult. It felt very devastating when Dave called. Dave and [his wife] Melissa called and let us know personally before it went out to the press.

The "Full House" alum revealed Thursday that he wasn't able to shave his head because he's filming a new project soon — and said the criticism "really hurt me."

John Stamos is facing backlash on social media for wearing a bald cap to support his “Full House” co-star Dave Coulier who shaved his head amid his stage 3 cancer battle. Stamos, 61, shared three Instagram photos Monday that featured him wearing his bald cap as he spent time with Coulier, 65.

I’m embarrassed for people that they waste time on this," Stamos said of the backlash. "All I was doing was cheering up a friend."

Earlier this month, the Full House actor - known for playing Joey Gladstone on the sitcom, revealed he had been diagnosed with a "very aggressive" form of non-Hodgkin lymphoma and was undergoing chemotherapy treatments.

John Stamos is defending his decision to wear a bald cap while visiting his Full House costar Dave Coulier after the actor announced he was battling cancer. Stamos, 61, said he was “shocked” by the backlash from fans,

John Stamos defended his actions after facing backlash for wearing a bald cap to show support for fellow “Full House” star Dave Coulier, amid his cancer battle. The internet attacked the famous actor when he shared Instagram posts of himself shaving Coulier’s head,