After the neck drowning try to keep the neck clean, dry, reduce friction, moisture and other stimuli, you can also use topical powder, avoid contact with irritating substances, it will gradually get better. The erythema that occurs after the skin is drowned is clinically known as friction erythema, also known as intertrigo, which tends to occur in the folds of the skin, and is a superficial inflammation that occurs as a result of stimuli such as warmth, moisture, and friction. Mild lesions appear mainly as erythema, and swelling, and if the lesions are further aggravated, vesicles, oozing, or superficial ulcers may appear. In treatment, it is important to keep the skin in the folds clean and dry, especially when sweating is high, and topical powders can be used after washing if necessary. In the early erythematous stage, you can also use topical boric acid talcum powder, pine pollen, zinc oxide puff powder, etc., to keep the local dry and avoid the stimulation of soap and hot water. If there is erosion, oozing, you can use topical zinc oxide oil or boric acid solution wet compresses, to be dry, you can change to cream. If secondary fungal or bacterial infection, you can also choose the appropriate antifungal drugs or antibiotic ointment for treatment.