There is no such thing as the fastest way to eliminate prickly heat on the back of adults. It is recommended to pay attention to skin care and give topical medication and oral medication if necessary, which can promote recovery. Prickly heat, also known as corn rash, tends to occur in summer or when the weather is hot. It is recommended to get out of the environment, do not scratch and stimulate the skin, and most of them can be cured by themselves. 1. Topical medication: If the itching is obvious and the symptoms are further aggravated, you can use glycerite lotion and tretinoin cream to apply, which can relieve itching and inhibit the regeneration of prickly heat. 2. Oral medication: If the itching is severe, you can give oral loratadine, chlorpheniramine, cetirizine and other antihistamines, which can relieve inflammation and reduce itching. If scratching secondary infection, can be given amoxicillin and other anti-infection treatment. The condition is further aggravated by a larger range of skin lesions, or the appearance of severe skin papules, papules, pustules. It is recommended to go to the dermatology department of the regular hospital, and the specific way of medication, subject to the guidance of the specialist.