Just like insect bites can cause itching, contact with skin and plant toxins can also cause itching. Studies on itching from oak leaves have found that when contacted with plant toxins, skin cells release histamine that causes redness and itching. Antihistamines such as diphenhydramine can treat this kind of itching, but there are no suitable drugs to treat itching caused by allergic eczema, etc. For the latter, the best advice is to wear loose clothing in any situation Do not scratch it with your hands. What does the following statement inconsistent with the original? ['Diphenhydramine cannot treat atopic eczema.', 'Antihistamines can be used to treat skin itching.', 'Itchy skin symptoms are the same but the mechanism may be different.', 'Reducing skin friction helps inhibit histamine activity.']