Hi,
According to your description the patches you mentioned could be
Acanthosis nigricans, these are dry, dark patches of skin that usually appear in the armpits, neck and groin. Sometimes it may be caused due to conditions like:
-
Overweight, Genetically inherited
-Type 2
diabetes, Poly cystic
ovarian disease,
Hypothyroidism, Cushing's syndrome, etc.
-Drugs like steroids, hormonal contraceptives
-Rarely malignancies like gastric malignancy.
As the spots are becoming bigger and new spots are appearing, better to consult your Physician once, get examined to find out the actual nature of the patches. If Acanthosis is confirmed, if he suggests, you can go for a detailed evaluation to find out the possible cause for it and take treatment accordingly.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Sree Gouri S. R., OBGYN