Is this kind of outlook in the wall inside an opened can looking normal?

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I have just opened an expired can of beans trying to clean the food stock due to epidemic situation. It expired approximately 6 months. The food looks alright, the outlook of the can doesn't have any sign of rust, looks as if new, the shape didn't transform also due to any form of chemical reaction like food releasing gas to pressure out.
But the wall inside the catch my attention. It has random black spots or pattern. I wonder if anyone have experience? Is this a sign of metal corrosion?
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What happens if a rectocele goes untreated?
If a rectocele is left untreated, the following complications may occur: Pressure or discomfort in the pelvic area. Constipation. Leakage of bowel movements (incontinence)What does a rectocele feel like to touch?
What does a rectocele feel like to touch? Your rectocele may be so slight that you can't feel it. If the prolapse is more pronounced, it may feel like a bulge or lump in the back wall of your vagina. You can insert a (clean) finger or two to feel for a rectocele.What happens when you have a rectocele?
A rectocele, a type of posterior vaginal prolapse, develops when the tissues between the rectum and vagina weaken, causing the rectum to bulge into the vagina. Symptoms of a rectocele may include pelvic, vaginal and rectal pressure.How do I know if I have a Cystocele or rectocele?
A cystocele is when the bladder and vaginal wall fall into the vaginal opening. A rectocele is when the rectum bulges into the front of the vagina.Gas prices: How high can they go?
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