It seems that it is either contact allergic dermatitis
You should immediately consult dermatologist
History taking, keen medical examination and blood investigation should be done.
After perfect diagnosis , treatment may be taken.
Antihistaminics, short course of steroids
,antibiotics..etc may be helpful.
Apply mild steroid cream.
Avoid soap bath.
No stress and worries.
You will be alright.
Dr. Ilyas patel MD