10/2 12:54 PM PT -- Mathew hopped on "TMZ Live" Wednesday and revealed he plans to remove the second breast in January.
10/2 6:12 AM PT -- 10/2 -- Mathew Knowles went on 'GMA' Wednesday to discuss his battle with breast cancer, and it sounds like early detection helped him in dealing and managing it.
Speaking with Michael Strahan, MK says a red dot that continued to appear on his shirt and sheets is what made him realize something might be wrong ... so he went and got a mammogram done, which he says revealed he did, in fact, have breast cancer.
Mathew also says he told his immediate family about the news, including his adult daughters, Beyonce and Solange -- whom he says both got tested shortly thereafter. As for him, he had a procedure done and is in treatment now -- Mathew's big point here is early detection, and urges folks to get themselves checked out if they suspect something's up.
Mathew Knowles has been diagnosed with breast cancer.
Beyonce and Solange's dad is opening up about his personal battle for the first time -- he's planning to discuss it on 'GMA' Wednesday morning. It's unclear how recently Mathew was diagnosed.
While breast cancer in male patients is rare, some of the numbers are alarming ... especially for Mathew.
Less than 1 percent of all breast cancer cases involve men. However, it's most frequently diagnosed in men between the ages of 60 and 70. Mathew is 67 years old.
Also, the median age for black male patients with breast cancer is 63.
According to the National Breast Cancer Foundation, the mortality rate for men is higher than it is for female patients.
Mathew remarried Gena Avery in 2013. He's had 2 more children since he and Tina Knowles divorced.
Originally Published -- 10/1 1:33 PM PT