How to solve the problem that there are red spots in the photos taken during macro photography?

Problem description:

I have a Sony dsc-s30 digital camera, and now I use this camera to take the original optical photos into digital photos and save them in my computer. Use the macro mode, turn off the flash, and the photos are clear, that is, there is a red spot the size of mung bean in each photo, and the seat is in the center of the photo. Can't find the reason. Who can give me some advice?

Analysis:

Just block the auxiliary focused light.