Richard Simmons is sparking concern for his well-being once again ... this time announcing he's been diagnosed with cancer.
The fitness guru says he got the skin cancer diagnosis after a recent visit to the dermatologist -- an appointment he made when he noticed a strange bump under his right eye that wouldn't go away.
Richard said Tuesday, in a Facebook post, his doctor removed the blemish, examined it and came back with a basal cell carcinoma diagnosis -- the most common form of skin cancer.