Hoppus says, “For the past three months I’ve been undergoing chemotherapy for cancer. I have cancer. It sucks and I’m scared, and at the same time I’m blessed with incredible doctors and family and friends to get me through this.”

He adds, “I still have months of treatment ahead of me but I’m trying to remain hopeful and positive. Can’t wait to be cancer free and see you all at a concert in the hopefully near future. Love to you all.”

In the pic, Mark is seen sitting down in a chair, with an IV hooked up to his arm. He seems to be in relatively good spirits — but his fans definitely weren’t upon seeing this … as it appears to be the first time anyone has gotten a whiff that he may be sick.