Thanks for the query.
You might have developed urticaria
It is an itchy condition of skin
Characterised by formation of recurrent red bumps.
The protein powder may be the causative agent.
Please stop it.
Also take some anti histamine
Please meet a dermatologist
for exact diagnosis.
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.