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.