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.

John Stamos is donning a bald cap after his "Full House" co-star Dave Coulier was diagnosed with "very aggressive" stage 3 Non-Hodgkin lymphoma.

John Stamos says he was caught off guard by the controversy his bald cap tribute to Dave Coulier has caused on social media. The actor ripped critics who slammed his Instagram post featuring the former “Full House” co-stars just days after Coulier announced he’d been diagnosed with Stage 3 non-Hodgkin lymphoma.

John Stamos shared a post in solidarity with former Full House co-star Dave Coulier — but fans weren't feeling the love.

Dave Coulier and John Stamos have a long history. The two spent years filming the beloved series Full House together, but their friendship did not end there. After the 65-year-old revealed he was diagnosed with stage 3 Non-Hodgkin lymphoma,