Deep prickly rash, also known as deep corn rash, occurs on the neck and trunk. The lesions are dense, non-inflammatory papules consistent with sweat pores that increase in size when sweating and are generally not itchy. There are many similarities between these lesion manifestations and those of other skin diseases, and these alone cannot identify eczema. So, how can they be identified? The main differentiation from acute eczema is prickly heat: 1. It is common in patients with severe and recurrent red milia. The lesions are dense, skin-colored blisters with clear content that are not easily broken and increase in size when sweating and decrease in size when not sweating. 2, when the rash is widespread, the whole body skin sweating reduced or no sweating, the face, axillae, hands and feet can have compensatory sweating increased, can cause tropical sweating closed exhaustion or heat exhaustion, the patient can appear weakness, sleepiness, dizziness, headache and other systemic symptoms. Acute eczema 1. Paroxysmal, persistent itching. Patients with eczema can experience intense itching at the lesions. This itching is paroxysmal and persistent, and does not subside even when the patient is distracted, and becomes more severe when the patient is quiet. 2, the lesions are in many forms of change. Eczema can be divided into primary and secondary rashes, the primary rash lesions are mainly manifested as papules, blister rashes, etc., while the secondary rash lesions are mainly manifested as vesicles, ooze and other forms, and the primary and secondary rashes can occur simultaneously. 3, long course of disease, easy to transfer. The course of eczema is long, up to several months to several years. The lesions of the disease can be transferred from one site to another. Acute eczema patients who are not treated properly can lead to the disease becomes chronic. And chronic eczema patients if improperly treated, and can lead to acute attacks. 4, painful position widely. Eczema can occur in any part of the body, mostly on the face, hands, feet, breasts and vulva.