Hello,
There are some possibilities which need to be evaluated and these include eczema, psoriasis, drug reaction, urticaria, erythema multiforme or systemic diseases like sarcoidosis or amyloidosis. To confirm the
diagnosis, you need to get a biopsy
skin done. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor.