It is very hard to evaluate through this medium regarding the exact nature of these sores. These are most commonly due to musculoskeletal strain brought about by stress. Also, a condition called fibromyalgia can present with multiple sore areas which can be compatible with your presentation.
The irregular periods may be a complication of your treatment especially if you have received chemotherapy for your disease. This is likely to normalize after a few months but if persistent, this may have to be evaluated by your gynecologist.
I would suggest that you have this examined by your doctor as there can be a lot of possibilities.
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