How are you? Are there other symptoms present? Skin lesions such as you mentioned could indeed be due to a variety of issues such as allergic reaction, irritation, infection, skin conditions and can also be associated to underlying medical illnesses. It is good that you were able to see a dermatologist. If the medication and biopsy done did not help, a second dermatologist's opinion may be needed. Additional diagnostic tests may need to be done. A journal to identify the possible triggers may also help. Your occupation and environmental conditions are also important factors to consider. Take care and do keep us posted.