Hi there...
Understand your anxiety about these patches.
There could be multiple reasons for its occurrence but whatever it is, it does not appear sinister or anything to be worried about and can be easily sorted.
Most likely in my humble opinion is a Drug reaction; going by the fact she is a diabetic, hypertensive etc she must be on different meds and anyone can be an issue &/or random painkillers or other meds.
However, please do NOT stop on your own...your regular physician may be able to help tweak your meds.
Should you wish for a prescription or for me to help sort this out ASAP, kindly connect via this App's INSTANT ONLINE Consultation 🙏
Alternatively can use a Practo linked App like Apollo 24/7 pathway.
Health Tips
Avoid OTC products, home remedies, self medication and Dr Google's suggestions 🙏