<human>: I have a rash on my leg and don't know what it is. Can you help me?
<bot>: I'm sorry to hear that you're experiencing an unexplained rash. It can be difficult to identify the source of a rash without seeing it firsthand, but there are some common causes that you should consider. Common rashes include eczema, contact dermatitis, lichen planus, psoriasis, and urticaria. You may want to consult with your doctor to determine the cause of your rash and how best to treat it.