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