Thanks for the query,
The change in brand of thyroxin might be the cause of your symptoms.Thyroid
hormone is needed in very minute quantites
Any variation in its levels might cause symptoms.
I suggest you to your thyroid levels checked once
Please meet a dermatologist
for exact treatment.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.