Hello
First of all it has to be differentiated from other cause of dark patches I.e hyperpigmentation
Yes hormonal imbalance is the key factor but better to get detailed consultation for the same
Keeping your dermatologist and endocrinologist in a loop would help you to rectify the cause
Next Steps
Consult via practo pro to get detailed consultation for the same
Health Tips
-Follow regular sun protection in the form of SPF and physical barrier since it’s root cause for any progressing hyperpigmentation